chore: update supported versions

[Rotzbua]

Changes

• drop eol django 3.2 4.0 4.1
• drop eol python 3.7
• drop untested PyPy support
• prepare python 3.12 test
• prepare django 5.1 test
• update GH action dependencies
• add dependabot to maintain GH action dependencies

Reference

fixes #540

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.24%. Comparing base (ef24fcb) to head (76b78ce).
Report is 7 commits behind head on master.

❗ Current head 76b78ce differs from pull request most recent head 50add66

Please upload reports for the commit 50add66 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #545      +/-   ##
==========================================
+ Coverage   89.92%   90.24%   +0.32%     
==========================================
  Files          31       31              
  Lines        1032     1056      +24     
  Branches      104      158      +54     
==========================================
+ Hits          928      953      +25     
+ Misses         69       68       -1     
  Partials       35       35              

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