Bump sphinx from 4.3.2 to 4.4.0

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 4.3.2 to 4.4.0.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/4.x/CHANGES)
- [Commits](https://github.com/sphinx-doc/sphinx/compare/v4.3.2...v4.4.0)

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

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

requirements-dev.txt

@@ -8,7 +8,7 @@ splinter==0.17.0
 selenium==4.1.0
 twine==3.7.1
 Pallets-Sphinx-Themes==2.0.2
-Sphinx==4.3.2
+Sphinx==4.4.0
 sphinx-issues==3.0.1
 sphinx-jinja==1.4.0
 sphinx-tabs==3.2.0