Add support for Django 5.2, as well as test against 5.2

[streeter]

Similar change to #835 to handle the fact that in Django 5.2, there is now a find_all keyword argument to the django.contrib.staticfiles.finders.find() function.

This also adds tests against Django 5.2 to ensure this will continue to work going forward.

Fixes #834
Fixes #835

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.18%. Comparing base (047894f) to head (f4c265d).
⚠️ Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
pipeline/finders.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #838      +/-   ##
==========================================
+ Coverage   82.50%   83.18%   +0.68%     
==========================================
  Files          33       33              
  Lines        1160     1160              
==========================================
+ Hits          957      965       +8     
+ Misses        203      195       -8     

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