Django-version-checks

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* Support Python 3.11.

* Support Django 4.1.

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* Drop support for Django 2.2, 3.0, and 3.1.

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* Drop Python 3.6 support.

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* Support Python 3.10.

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* Support Django 4.0.

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* Add type hints.

* Stop distributing tests to reduce package size. Tests are not intended to be
run outside of the tox setup in the repository. Repackagers can use GitHub's
tarballs per tag.