Bump sphinx from 4.3.2 to 6.1.3

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 4.3.2 to 6.1.3.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinx@v4.3.2...v6.1.3)

---
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

@@ -5,7 +5,7 @@ black==22.12.0
 check-manifest==0.49
 flake8==4.0.1
 pytest==7.2.2
-Sphinx==4.3.2
+Sphinx==6.1.3
 tox==3.25.0
 tox-gh-actions==2.9.1
 twine==4.0.2