chore: drop Django 4.2 support

[aznszn]

Remove Django 4.2 from CI matrix, tox envlist, setup.py classifiers, and all requirements files. Only Django 5.2 is now supported.

Issue: openedx/public-engineering#458

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[mphilbrick211]

Hi @aznszn! It looks like you're contributing on behalf of Arbisoft - please have your manager reach out to oscm@axim.org to request that you be added to our existing entity agreement. That way, your CLA check will turn green and we can get this through. Thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.90%. Comparing base (44439ad) to head (e462971).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #451   +/-   ##
=======================================
  Coverage   95.90%   95.90%           
=======================================
  Files          18       18           
  Lines         488      488           
  Branches       55       55           
=======================================
  Hits          468      468           
  Misses         19       19           
  Partials        1        1           

Flag	Coverage Δ
unittests	95.90% <ø> (ø)

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