[3.2.x] Bumped minimum Sphinx version to 4.5.0.
[3.2.x] Bumped minimum Sphinx version to 4.5.0.

Related Sphinx changes:
- https://github.com/sphinx-doc/sphinx/pull/8898
- https://github.com/sphinx-doc/sphinx/issues/8326

Backport of ebf25555bbed3e9112d4b726575d60b242daf48a from main.

koordinates/django,koordinates/django,koordinates/django,koordinates/django