Merge pull request #627 from jazzband/dependabot/pip/docs/_ext/django…

…dummy/django-4.2.18

Bump django from 4.2.16 to 4.2.18 in /docs/_ext/djangodummy

Merge pull request #606 from jazzband/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate

Increased version to 4.0.0a

Django 4.0 support and many fixes

Fix admin

Fix import

Django 2.2 support

Fixed Django 2.1

fixed manager inheritance