Fix Django 5.1+ admin tests

[justmobilize]

This fixes Django 5.1+ admin tests, since in Django 5.1+, the header has a class definition in the H2

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.10%. Comparing base (6931c45) to head (1988923).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #646      +/-   ##
==========================================
+ Coverage   84.44%   85.10%   +0.66%     
==========================================
  Files          21       21              
  Lines         752      752              
  Branches      123      123              
==========================================
+ Hits          635      640       +5     
+ Misses         85       81       -4     
+ Partials       32       31       -1     

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