Add support for python 3.14

[eivindjahren]

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'just rapid-tests')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Add backport label to latest release (format: 'backport release-branch-name')

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.55%. Comparing base (aca683f) to head (f0f0d1f).
⚠️ Report is 7 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12450   +/-   ##
=======================================
  Coverage   90.55%   90.55%           
=======================================
  Files         432      432           
  Lines       29296    29285   -11     
=======================================
- Hits        26529    26520    -9     
+ Misses       2767     2765    -2     

Flag	Coverage Δ
cli-tests	37.73% <ø> (+0.07%)	⬆️
gui-tests	69.44% <ø> (+0.04%)	⬆️
performance-and-unit-tests	74.08% <ø> (-0.01%)	⬇️
test	38.60% <ø> (+0.01%)	⬆️

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