Bump sphinx from 7.0.1 to 8.1.3

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.0.1 to 8.1.3.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.0.1...v8.1.3)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements-dev.txt

@@ -6,7 +6,7 @@ mypy==1.11.2
 pre-commit==4.0.1
 pygments==2.18.0
 pyupgrade==3.18.0
-sphinx==7.0.1
+sphinx==8.1.3
 tox==4.21.2
 types-requests==2.32.0.20240914
 types-setuptools==75.1.0.20240917