fixes related_filter for django 5 support

[fpintoppb]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 29.71%. Comparing base (0256ad9) to head (eea6cbf).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
theme/filters.py	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
- Coverage   29.83%   29.71%   -0.12%     
==========================================
  Files           9        9              
  Lines         533      535       +2     
==========================================
  Hits          159      159              
- Misses        374      376       +2     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud