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 90.62%. Comparing base (d75b9bd) to head (f5732ac).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12450      +/-   ##
==========================================
+ Coverage   90.55%   90.62%   +0.07%     
==========================================
  Files         454      454              
  Lines       31233    31230       -3     
==========================================
+ Hits        28282    28303      +21     
+ Misses       2951     2927      -24     

Flag	Coverage Δ
cli-tests	37.27% <ø> (+<0.01%)	⬆️
gui-tests	68.14% <ø> (+0.14%)	⬆️
performance-and-unit-tests	77.20% <ø> (+0.07%)	⬆️
test	46.17% <ø> (+<0.01%)	⬆️

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[larsevj]

I believe this one should be doable now.

[eivindjahren]

I believe this one should be doable now.

@larsevj We need py314 builds for carolina first:

hint: You're using CPython 3.14 (`cp314`), but `carolina` (v2.0.2) only has wheels with the following Python ABI tags: `cp311`, `cp312`, `cp313`

That is probably not going to be easy, but you are welcome to try.

[larsevj]

I believe this one should be doable now.

@larsevj We need py314 builds for carolina first:

hint: You're using CPython 3.14 (`cp314`), but `carolina` (v2.0.2) only has wheels with the following Python ABI tags: `cp311`, `cp312`, `cp313`

That is probably not going to be easy, but you are welcome to try.

I see, will give it a try 😄

[larsevj]

Python 3.14 wheels are available with the latest carolina release now.

[eivindjahren]

@larsevj Builds now but seems to consistently fail the following test:

FAILED tests/ert/unit_tests/services/test_ert_server.py::test_that_connect_logs_permission_error - TimeoutError: Server not started

[larsevj]

Believe it is pathlib.Path.exists() that no longer raises PermissionError on python3.14, see: python/cpython#118243

[eivindjahren]

Believe it is pathlib.Path.exists() that no longer raises PermissionError on python3.14, see: python/cpython#118243

Then I think it would be correct to skip the test on 3.14.

[codspeed-hq]

Merging this PR will not alter performance

✅ 35 untouched benchmarks

---

_{Comparing eivindjahren:add_3.14 (f5732ac) with main (59c6655)}

[larsevj]

👍