Update Python and Django version support

[codingjoe]

• Add Django 5.0
• Add Django 4.2 LTS
• Add Python 3.12
• Drop Django 4.0 (EOL)
• Drop Django 4.1 (EOL)
• Drop Python 3.9

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.03%. Comparing base (843b227) to head (fca1628).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #287   +/-   ##
=======================================
  Coverage   98.03%   98.03%           
=======================================
  Files           8        8           
  Lines         204      204           
=======================================
  Hits          200      200           
  Misses          4        4           

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