Bug#1142902: ubelt: FTBFS: AttributeError: 'Constant' object has no attribute 's'

Package: src:ubelt
Version: 1.4.0-1
Severity: serious
Tags: ftbfs forky sid

Dear maintainer:

During a rebuild of all packages in unstable, this package failed to build.

Below you will find the last part of the build log (probably the most
relevant part, but not necessarily). If required, the full build log
is available here:

https://people.debian.org/~sanvila/build-logs/202607/

About the archive rebuild: The build was made on virtual machines from AWS,
using sbuild and a reduced chroot with only build-essential packages.

If you cannot reproduce the bug please contact me privately, as I
am willing to provide ssh access to a virtual machine where the bug is
fully reproducible.

If this is really a bug in one of the build-depends, please use
reassign and add an affects on src:ubelt, so that this is still
visible in the BTS web page for this package.

Thanks.

--------------------------------------------------------------------------------
[...]
Traceback
=========

      File "/usr/lib/python3/dist-packages/sphinx/config.py", line 611, in eval_config_file
        raise ConfigError(msg % traceback.format_exc()) from exc
    sphinx.errors.ConfigError: There is a programmable error in your configuration file:
    
    Traceback (most recent call last):
      File "/usr/lib/python3/dist-packages/sphinx/config.py", line 596, in eval_config_file
        exec(code, namespace)  # NoQA: S102
        ~~~~^^^^^^^^^^^^^^^^^
      File "/<<PKGBUILDDIR>>/docs/source/conf.py", line 149, in <module>
        release = parse_version(modpath)
      File "/<<PKGBUILDDIR>>/docs/source/conf.py", line 137, in parse_version
        visitor.visit(pt)
        ~~~~~~~~~~~~~^^^^
      File "/usr/lib/python3.14/ast.py", line 506, in visit
        return visitor(node)
      File "/usr/lib/python3.14/ast.py", line 514, in generic_visit
        self.visit(item)
        ~~~~~~~~~~^^^^^^
      File "/usr/lib/python3.14/ast.py", line 506, in visit
        return visitor(node)
      File "/<<PKGBUILDDIR>>/docs/source/conf.py", line 135, in visit_Assign
        self.version = node.value.s
                       ^^^^^^^^^^^^
    AttributeError: 'Constant' object has no attribute 's'


The full traceback has been saved in:
/tmp/sphinx-err-3vti2an5.log

To report this error to the developers, please open an issue at <https://github.com/sphinx-doc/sphinx/issues/>. Thanks!
Please also report this if it was a user error, so that a better error message can be provided next time.
make[2]: *** [Makefile:20: html] Error 2
make[2]: Leaving directory '/<<PKGBUILDDIR>>/docs'
make[1]: *** [debian/rules:10: execute_after_dh_auto_build] Error 2
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:6: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2
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