Add Django 5.1 support

[benjaoming]

Necessary for django-wiki/django-wiki#1372

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.41%. Comparing base (98250c5) to head (5b7a612).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #145   +/-   ##
=======================================
  Coverage   78.41%   78.41%           
=======================================
  Files          24       24           
  Lines         667      667           
=======================================
  Hits          523      523           
  Misses        144      144           

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