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>

Pipfile

@@ -61,7 +61,7 @@ pytest-django = "*"
 pytest-env = "*"
 pytest-sugar = "*"
 pytest-xdist = "*"
-sphinx = "~=5.0.2"
+sphinx = "~=5.1.1"
 sphinx_rtd_theme = "*"
 tox = "*"
 black = "*"