Support Django 5.2, 6.0; drop support for Django<4.2

Python & Django Support

• Python 3.10, 3.11, 3.12, 3.13, 3.14
• Django 4.2, 5.2, 6.0

What's Changed

• Drop support for following (#303)
  • Python 3.6, 3.7, 3.8, 3.9
  • Django 2.2, 3.0, 3.1, 3.2, 4.0, 4.1
• Add Django 5.2 compatibility (#325, thanks @justinmayer):
  • Mark last_login and date_joined as readonly in UserAdmin
• Add Django 6.0 compatibility (#338)
• Cleanup of deprecated Django APIs (#303):
  • Replace force_text with force_str
  • Remove default_app_config
  • Remove USE_L10N
• Fix missing import display in quickstart docs (#324, thanks @offby1)
• Development/maintenance:
  • Migrate test runner from tox to nox (#327)
  • Migrate build and dev tooling from flit/pip to uv (#328)

New Contributors

• @offby1 made their first contribution in #324

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Full Changelog: v2.1.0...v3.0.0