Add official support for Django 5.0 and Python 3.12, drop support for Django <3.2

[browniebroke]

No description provided.

[browniebroke]

As far as I can tell, the failures are from mypy, looks like the config crashes:

mypy.ini:2: error: Error importing plugin "mypy_django_plugin.main": cannot import name 'has_placeholder' from 'mypy.semanal_shared' (...python3.11/site-packages/mypy/semanal_shared.py)

It fails on older versions too, so maybe it's a 3rd party package not being pinned properly?

[browniebroke]

Gentle ping @ir4y - what do we need to get this merged?

[ir4y]

Hi @browniebroke

Thank you for your contribution. Could you please fix the tests?
Once all of them are passed I will merge this changes.

Cheers,
Ilya

[ir4y]

@browniebroke please feel free to include changes from #184 in this pull request and drop support for Django version that reached end of support period.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.23%. Comparing base (6b24fae) to head (f147adf).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #183   +/-   ##
=======================================
  Coverage   98.23%   98.23%           
=======================================
  Files           3        3           
  Lines         227      227           
=======================================
  Hits          223      223           
  Misses          4        4           

Flag	Coverage Δ
unittests	98.23% <ø> (ø)

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[browniebroke]

@ir4y it's all passing now. Since I opened this, Django 3.2 reached EOL and DRF 3.15 was released. I could go a few steps further and drop support for Django <4.2 (which would mean dropping DRF <3.14) and add support for DRF 3.15, but that feels like a lot? Do you want to merge this one and do a release before moving on to the next set of fixes?

I'm trying to think of an upgrade path where users wouldn't have to upgrade too much at once, but actually I didn't really change anything in the code being released...

Edit: further changes that build on top of this #186 can be merged after if you want