[upd] pypi: Bump sphinx from 7.4.7 to 8.2.1

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.4.7 to 8.2.1.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/v8.2.1/CHANGES.rst)
- [Commits](https://github.com/sphinx-doc/sphinx/compare/v7.4.7...v8.2.1)

---
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 @@ pylint==3.3.4
 splinter==0.21.0
 selenium==4.29.0
 Pallets-Sphinx-Themes==2.3.0
-Sphinx==7.4.7
+Sphinx==8.2.1
 sphinx-issues==5.0.0
 sphinx-jinja==2.0.2
 sphinx-tabs==3.4.7