Bump sphinx from 5.0.2 to 5.1.1

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 5.0.2 to 5.1.1.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/5.x/CHANGES)
- [Commits](https://github.com/sphinx-doc/sphinx/compare/v5.0.2...v5.1.1)

---
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==0.18.1
 selenium==4.3.0
 twine==4.0.1
 Pallets-Sphinx-Themes==2.0.2
-Sphinx==5.0.2
+Sphinx==5.1.1
 sphinx-issues==3.0.1
 sphinx-jinja==2.0.2
 sphinx-tabs==3.4.1