fix: make named axis thread-safe and start testing using multiple threads in CI

[ikrommyd]

Fixes #3802
Closes #3803

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.61%. Comparing base (7661d5a) to head (49ee9a6).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
src/awkward/_namedaxis.py	91.28% <100.00%> (+0.09%)	⬆️

... and 2 files with indirect coverage changes

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[github-actions]

The documentation preview is ready to be viewed at http://preview.awkward-array.org.s3-website.us-east-1.amazonaws.com/PR3805

[pfackeldey]

This looks good to me know! I'm approving the python side here that makes things thread-safe. @ariostas could you review/approve the CI part of this PR?

[ariostas]

The CI side looks good to me! It does make sense to separate "nogil" and "basic". We should have done that before. And yeah, we should have been testing 3.14t on macOS.

[ikrommyd]

@henryiii said on slack this is good. Can we merge it?

[ianna]

@henryiii said on slack this is good. Can we merge it?

Sure, go ahead 🙌