Add Django 5 support (without Python 3.12)

[pfouque]

Just adding last version of Django to the test matrix and package classifier

The test results are available on my repository: pfouque#1

Reworked to split with #284 (depending on the first to merge we will have to adapt)
(We will have to update the Django 5 version number anyway as soon it's officially released)

[marianoeramirez]

Its hard that this work. Because we need to upgrade some dependents librarys like django-dbdiff or get rid of it.

[pfouque]

Thanks for the tip @marianoeramirez, It will take time a bit more time to investigate if the best way is to find an alternative test method or update django-dbdiff (it has only one usage of the imp module but has not been updated in a while...)

[pfouque]

Depends on yourlabs/django-dbdiff#21

[adamchainz]

Adding some minor comments.

[pfouque]

I temporarily added yourlabs/django-dbdiff#21 as the source dependency and it looks fine!
https://github.com/pfouque/django-cities-light/actions/runs/6835469902

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (95d2af7) 91.24% compared to head (2646674) 91.24%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #283   +/-   ##
=======================================
  Coverage   91.24%   91.24%           
=======================================
  Files          44       44           
  Lines        1794     1794           
=======================================
  Hits         1637     1637           
  Misses        157      157           

[marianoeramirez]

@pfouque can you update your base branch with last commits?

[pfouque]

:(