Bump sphinx from 4.3.0 to 4.3.1

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 4.3.0 to 4.3.1.
- [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/v4.3.0...v4.3.1)

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

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

requirements-dev.txt

@@ -7,7 +7,7 @@ splinter==0.16.0
 selenium==3.141.0
 twine==3.6.0
 Pallets-Sphinx-Themes==2.0.2
-Sphinx==4.3.0
+Sphinx==4.3.1
 sphinx-issues==1.2.0
 sphinx-jinja==1.1.1
 sphinx-tabs==3.2.0