Add support for Django 4.2, 5.0 and Python 3.11, 3.12

[georgek]

Drop support for Django 2.2, 4.0 and Python 3.7

Also simplified the Github actions pipeline using tox-gh-actions.

Coverage for pypy has been disabled due to : nedbat/coveragepy#1382

[Zerotask]

@dfunckt any update on this?

[georgek]

Anyone know why the CI checks aren't running? Seems to affect other PRs on this repo.

[federicobond]

It might be due to an error in the workflow file.

Btw, I emailed @dfunckt yesterday and he agreed to let me take over some maintenance duties, so getting support for latest versions merged is a priority.

[federicobond]

CI is running now, I've asked @dfunckt to update the required statuses configuration so we can move forward with this.

[dfunckt]

Your message never reached me, but I’ve had a look and updated the required checks and this is now mergable. Go for it!

EDIT: Got your message.

[federicobond]

Merging this, we might want to fix the empty () in the CI jobs later, but not sure if it requires reconfiguring the required statuses.