[PATCH -perfbook] Revert "Work around conflict between arydshln and array v2.6"

This reverts commit c1fdb7c375c71bd580d8b914c0fc76e8fa8f62c9.

The issue is now taken care of by latex-firstaid 1.1f (not a usual
.sty file, but a collection of hotfix patches to be loaded during
latex format generation) released June 26, 2024 [1].

Revert the rollback of array.

Link: https://ctan.org/pkg/latex-firstaid # [1]
Signed-off-by: Akira Yokosawa <[email protected]>
---
 perfbook-lt.tex | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/perfbook-lt.tex b/perfbook-lt.tex
index 21713a91..0fa51425 100644
--- a/perfbook-lt.tex
+++ b/perfbook-lt.tex
@@ -9,9 +9,6 @@
 % within a page. See: https://tex.stackexchange.com/questions/183149/
 \ifdefined\pdfsuppresswarningpagegroup \pdfsuppresswarningpagegroup=1 \fi
 
-% Work around conflict between arydshln and array since array v2.6c
-\RequirePackage{array}[=2024-05-01] % One month before the release date of v2.6c
-
 % standard packages
 
 % A more pleasant font

base-commit: c47b401fb4c031592552e56020aa2c6ddc2dc8d9
-- 
2.34.1