Upgrade to Python 3.12

[Viicos]

Closes #3197

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • Checked copying a form
  • Checked import/export of a form
  • Config checks in the configuration overview admin page
  • Problem detection in the admin email digest is handled

• Release management

  • I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • Ran ./bin/makemessages_js.sh
  • Ran ./bin/compilemessages_js.sh

• Commit hygiene

  • Commit messages refer to the relevant Github issue
  • Commit messages explain the "why" of change, not the how

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.56%. Comparing base (1033b07) to head (533f12b).
Report is 484 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4553      +/-   ##
==========================================
- Coverage   96.60%   96.56%   -0.04%     
==========================================
  Files         725      725              
  Lines       24129    24131       +2     
  Branches     2871     3175     +304     
==========================================
- Hits        23309    23303       -6     
- Misses        559      569      +10     
+ Partials      261      259       -2     

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[sergei-maertens]

noice, I'm curious if we'll see the performance improvements in APM