Bump sphinx from 4.1.1 to 4.1.2 (#360)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 4.1.1 to 4.1.2.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/4.x/CHANGES)
- [Commits](sphinx-doc/sphinx@v4.1.1...v4.1.2)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements-dev.txt

@@ -2,5 +2,5 @@ setuptools==58.0.4
 wheel==0.37.0
 twine==3.4.2
 unittest-xml-reporting==3.0.4
-sphinx==4.1.1
+sphinx==4.1.2
 sphinx-rtd-theme==0.5.2