Update Python & Django supported versions + migrate to ruff

[samiashi]

Update Python supported versions - https://devguide.python.org/versions/

• Drop support for Python 3.6 & 3.7
• Add support for Python 3.11 & 3.12

Update Django supported versions - https://www.djangoproject.com/download/#supported-versions

• Drop support for Django 2.2, 3.0 & 3.1
• Add support for Django 4.2 & 5.0

Migrate to ruff - https://github.com/astral-sh/ruff

• Replace flake8 & black with ruff
• Format files with ruff

Miscellaneous

• Fixed markdown violations

[PacificGilly]

@farridav the 3.11 build is failing https://github.com/farridav/django-jazzmin/actions/runs/8481330654/job/23245748961?pr=551

  coveralls.exception.CoverallsException: Not on TravisCI. You have to provide either repo_token in .coveralls.yml or set the COVERALLS_REPO_TOKEN env var.

I'm not sure why it can't find the COVERALLS_REPO_TOKEN env var as your PRs work without issue. Without seeing the settings, I'm guessing this token is also working with your account maybe? https://github.com/samiashi/django-jazzmin/blob/8a20f52fed70ee8de7a80ae7c2a9d093f3a09830/.github/workflows/build.yml#L18

[farridav]

Yeah it's odd, probably some sort of a permissions issue, I will see if I can make sense of it and get the coveralls token working properly

[farridav]

Right, lets get this moving.. a massive step in the right direction here ..

Next steps will be to make the entire codebase properly typed, start making use of pydantic (or at least data classes) for configuration.

And get some better test coverage :)

[farridav]

Can we get a reabase on this ? Then we can get it merged ...

[samiashi]

Can we get a reabase on this ? Then we can get it merged ...

@farridav Should be rebased with master now