deps: Bump sphinx from 7.3.7 to 8.0.2

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.3.7 to 8.0.2.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/v8.0.2/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.3.7...v8.0.2)

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

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

docs/requirements.txt

@@ -1,5 +1,5 @@
 furo==2024.8.6
-sphinx==7.3.7;python_version>="3.9"
+sphinx==8.0.2;python_version>="3.9"
 sphinx==7.1.2;python_version<"3.9"
 sphinx-toolbox==3.8.0
 sphinxcontrib-prettyspecialmethods==0.1.0