Add Python 3.13 to the testing

[cclauss]

• https://www.python.org/downloads/release/python-3130/
• https://pythoninsider.blogspot.com/2024/10/python-3130-final-released.html
• https://devguide.python.org/versions/
• https://docs.djangoproject.com/en/stable/faq/install/#what-python-version-can-i-use-with-django

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.81%. Comparing base (b01dc3e) to head (c07b1c5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #813      +/-   ##
==========================================
- Coverage   86.92%   86.81%   -0.11%     
==========================================
  Files          32       32              
  Lines         933      933              
  Branches      124       74      -50     
==========================================
- Hits          811      810       -1     
- Misses        103      105       +2     
+ Partials       19       18       -1     

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[Nusnus]

Thank you!