Bump sphinx from 3.4.3 to 4.4.0

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 3.4.3 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/v3.4.3...v4.4.0)

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

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

Pipfile

@@ -57,7 +57,7 @@ pytest-django = "*"
 pytest-env = "*"
 pytest-sugar = "*"
 pytest-xdist = "*"
-sphinx = "~=3.4.2"
+sphinx = "~=4.4.0"
 sphinx_rtd_theme = "*"
 tox = "*"
 black = "*"