SIANXKE-404: Update Python, Django, and package versions

[bernhard-hagmann]

• Updated Python, Django, and Package versions
• Updated obsolete assertEquals to assertEqual
• Flipped first and second argument of assertEqual calls, to fix error messages (1: expected, 2: actual)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.80%. Comparing base (358ccfb) to head (ac3b3c8).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #12   +/-   ##
=======================================
  Coverage   63.80%   63.80%           
=======================================
  Files           2        2           
  Lines         105      105           
=======================================
  Hits           67       67           
  Misses         38       38           

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