bug#81658: 31.1; :custom-face doesn't work anymore

After I upgrade Emacs to 31 on macOS, :custom-face of use-package seems not working with doom-themes. 

My config:

```elisp
(use-package doom-themes
  :init (load-theme 'doom-one-theme t))

(use-package symbol-overlay
  :custom-face
  (symbol-overlay-default-face ((t (:inherit region :background unspecified :foreground unspecified))))
  (symbol-overlay-face-1 ((t (:inherit nerd-icons-blue :background unspecified :foreground unspecified :inverse-video t))))
  (symbol-overlay-face-2 ((t (:inherit nerd-icons-pink :background unspecified :foreground unspecified :inverse-video t))))
  (symbol-overlay-face-3 ((t (:inherit nerd-icons-yellow :background unspecified :foreground unspecified :inverse-video t))))
  (symbol-overlay-face-4 ((t (:inherit nerd-icons-purple :background unspecified :foreground unspecified :inverse-video t))))
  (symbol-overlay-face-5 ((t (:inherit nerd-icons-red :background unspecified :foreground unspecified :inverse-video t))))
  (symbol-overlay-face-6 ((t (:inherit nerd-icons-orange :background unspecified :foreground unspecified :inverse-video t))))
  (symbol-overlay-face-7 ((t (:inherit nerd-icons-green :background unspecified :foreground unspecified :inverse-video t))))
  (symbol-overlay-face-8 ((t (:inherit nerd-icons-cyan :background unspecified :foreground unspecified :inverse-video t))))
  :bind (("M-i"  . symbol-overlay-put)
         ("M-n"  . symbol-overlay-jump-next)
         ("M-p"  . symbol-overlay-jump-prev))
  :bind-keymap ("M-s s"  . symbol-overlay-map)
  :hook (prog-mode yaml-mode yaml-ts-mode))
```

It seems this was a recent change in use-package. Pre-31, :custom-face
used face-spec-set without the face-defface-spec type (which makes it
equivalent to custom-set-faces), but now it does.

Now the workaround is use `custom-set-faces` or revert
`use-package-handler/:custom-face` to the old version.

Please see https://github.com/doomemacs/themes/issues/893 for more
details.

In GNU Emacs 31.1 (build 1, aarch64-apple-darwin25.5.0, NS
appkit-2685.60 Version 26.5.2 (Build 25F84)) of 2026-08-19 built on
sjc22-bm210-e307fdb9-8f97-4f54-8579-54c29824f34f-3E65A34C818D.local
Repository revision: 1988e330c1c5ad6f161e66c348cd8e65cd95e9cd
Repository branch: emacs-31
Windowing system distributor 'Apple', version 10.3.2685
System Description:  macOS 26.6.2

Configured using:
 'configure 'CFLAGS=-DFD_SETSIZE=10000 -DDARWIN_UNLIMITED_SELECT
-I/opt/homebrew/opt/gcc/include -I/opt/homebrew/opt/libgccjit/include'
'LDFLAGS=-L/opt/homebrew/lib/gcc/current
-Wl,-rpath,/opt/homebrew/lib/gcc/current'
--enable-locallisppath=/opt/homebrew/share/emacs/site-lisp --with-ns
--with-native-compilation=aot --with-xwidgets --with-tree-sitter
--with-mailutils --with-modules --with-rsvg --with-webp --without-dbus
--without-compress-install'

Configured features:
ACL GLIB GNUTLS JPEG LCMS2 LIBXML2 MODULES NATIVE_COMP NOTIFY KQUEUE NS
PDUMPER PNG RSVG SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER
WEBP XIM XWIDGETS ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8

Major mode: Elisp/l

Minor modes in effect:
  windmove-mode: t
  popper-tab-line-mode: t
  popper-mode: t
  gcmh-mode: t
  pulsar-global-mode: t
  pulsar-mode: t
  save-place-mode: t
  savehist-mode: t
  doom-modeline-mode: t
  minions-mode: t
  default-text-scale-mode: t
  global-page-break-lines-mode: t
  page-break-lines-mode: t
  transient-posframe-mode: t
  ace-pinyin-global-mode: t
  ace-pinyin-mode: t
  global-anzu-mode: t
  anzu-mode: t
  beginend-global-mode: t
  beginend-prog-mode: t
  drag-stuff-global-mode: t
  drag-stuff-mode: t
  electric-pair-mode: t
  global-hungry-delete-mode: t
  hungry-delete-mode: t
  xclip-mode: t
  global-so-long-mode: t
  vertico-posframe-mode: t
  vertico-mode: t
  nerd-icons-completion-mode: t
  marginalia-mode: t
  corfu-popupinfo-mode: t
  corfu-history-mode: t
  global-corfu-mode: t
  corfu-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  global-hl-line-mode: t
  global-region-occurrences-highlighter-mode: t
  region-occurrences-highlighter-mode: t
  global-colorful-mode: t
  colorful-mode: t
  global-diff-hl-show-hunk-mouse-mode: t
  diff-hl-show-hunk-mouse-mode: t
  diff-hl-flydiff-mode: t
  global-diff-hl-mode: t
  diff-hl-mode: t
  delete-selection-mode: t
  tabspaces-mode: t
  popterm-global-mode: t
  which-key-posframe-mode: t
  which-key-mode: t
  display-line-numbers-mode: t
  goto-address-prog-mode: t
  flyspell-mode: t
  subword-mode: t
  symbol-overlay-mode: t
  display-fill-column-indicator-mode: t
  indent-bars-mode: t
  rainbow-delimiters-mode: t
  goggles-mode: t
  flyover-mode: t
  flymake-mode: t
  persistent-scratch-autosave-mode: t
  magit-prime-mode: t
  magit-todos-mode: t
  global-hl-todo-mode: t
  hl-todo-mode: t
  global-git-commit-mode: t
  global-auto-revert-mode: t
  server-mode: t
  global-treesit-auto-mode: t
  editorconfig-mode: t
  recentf-mode: t
  solaire-global-mode: t
  override-global-mode: t
  apheleia-global-mode: t
  apheleia-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  prettify-symbols-mode: t
  tab-bar-history-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  window-divider-mode: t
  minibuffer-nonselected-mode: t
  minibuffer-regexp-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  hs-minor-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rfc822 mml mml-sec gnus-util
mm-decode mm-bodies mm-encode mailabbrev gmm-utils mailheader sendmail
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elfeed elfeed-curl elfeed-log elfeed-db elfeed-lib shr pixel-fill
kinsoku svg avl-tree generator url-queue url-file xml-query apheleia
apheleia-rcs apheleia-dp apheleia-formatters apheleia-utils apheleia-log
apheleia-formatter-context shortdoc shortdoc-doc ace-window cape-keyword
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rfc2231 rfc2047 rfc2045 mm-util ietf-drums mail-prsvr url-gw nsm puny
url-cache url-auth newst-treeview newst-reader newst-backend xml
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find-func sh-script smie executable windmove tab-line popper-echo popper
gcmh pulsar atomic-chrome websocket bindat let-alist saveplace savehist
doom-modeline doom-modeline-segments doom-modeline-env
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page-break-lines transient-posframe ace-pinyin pinyinlib avy anzu
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facemenu dom mc-cycle-cursors multiple-cursors-core expand-region
subword-mode-expansions text-mode-expansions er-basic-expansions
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vertico-posframe vertico-multiform vertico nerd-icons-completion
marginalia corfu-popupinfo corfu-history corfu-auto corfu
yasnippet-snippets yasnippet vc-git time hl-line
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indent-bars noutline outline rainbow-delimiters goggles pulse color
flyover checkdoc lisp-mnt flymake project persistent-scratch rg vc
vc-dispatcher rg-info-hack info rg-menu rg-ibuffer rg-result wgrep-rg
wgrep rg-history rg-header ibuf-ext ibuffer ibuffer-loaddefs magit-prime
tramp-sh tramp-cache time-stamp tramp trampver tramp-integration files-x
tramp-message tramp-compat parse-time iso8601 time-date tramp-loaddefs
magit-bookmark magit-submodule magit-blame magit-stash magit-reflog
magit-bisect magit-push magit-pull magit-fetch magit-clone magit-remote
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magit-merge magit-branch magit-reset magit-files bookmark magit-refs
magit-todos pcre2el rxt advice re-builder hl-todo f async magit-status
magit epa magit-repos magit-apply dired-x dired dired-loaddefs magit-wip
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magit-process with-editor shell pcomplete magit-mode benchmark magit-git
server magit-base magit-section cursor-sensor transient byte-opt
format-spec crm llama comp comp-cstr warnings comp-run comp-common
cond-let treesit-auto treesit editorconfig editorconfig-core
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init-highlight init-dired init-dashboard dashboard dashboard-widgets
rect recentf tree-widget ffap thingatpt nerd-icons nerd-icons-faces
nerd-icons-data nerd-icons-data-mdicon nerd-icons-data-flicon
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nerd-icons-data-octicon nerd-icons-data-pomicon nerd-icons-data-ipsicon
init-calendar init-bookmark derived init-snippet init-completion
init-edit init-ui solaire-mode doom-themes-ext-visual-bell face-remap
posframe doom-one-theme doom-themes doom-themes-base init-hydra
pretty-hydra hydra ring lv s dash compat init-base diminish edmacro
kmacro use-package-bind-key exec-path-from-shell bind-key init-package
finder-inf ace-pinyin-autoloads add-node-modules-path-autoloads
agent-shell-autoloads acp-autoloads anzu-autoloads apheleia-autoloads
atom-one-dark-theme-autoloads atomic-chrome-autoloads
auto-dark-autoloads avy-zap-autoloads beginend-autoloads
browse-kill-ring-autoloads cal-china-x-autoloads cape-autoloads
cask-mode-autoloads circadian-autoloads cmake-mode-autoloads
coffee-mode-autoloads colorful-mode-autoloads consult-dir-autoloads
consult-eglot-autoloads consult-flyspell-autoloads
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cue-sheet-mode-autoloads rx dape-autoloads dart-mode-autoloads
dashboard-autoloads default-text-scale-autoloads devdocs-autoloads
diff-hl-autoloads diminish-autoloads dired-git-info-autoloads
dired-quick-sort-autoloads dired-rsync-autoloads diredfl-autoloads
docker-autoloads aio-autoloads doom-modeline-autoloads
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emacs)

Memory information:
((conses 16 1082288 777794) (symbols 48 51850 3) (strings 32 295353 52715) (string-bytes 1 12515364)
 (vectors 16 94328) (vector-slots 8 1494211 229529) (floats 8 2592 7580) (intervals 56 32885 7899)
 (buffers 1064 113))