chore: Update Python version from 3.10 to 3.14 in ROOT workflow

[ianna]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.65%. Comparing base (a6c3b25) to head (5c02f2f).

Additional details and impacted files

see 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/PR3876

[ianna]

The tests run locally on my mac, but it looks like the C++ code is not interpreted by the ROOT.gInterpreter in CI tests on Linux. I've asked the ROOT team on Mattermost if anything changed in ROOT 6.36.06.

[ianna]

I think, we may want to move to Python 3.14 for tests

[ianna]

The tests run locally on my mac, but it looks like the C++ code is not interpreted by the ROOT.gInterpreter in CI tests on Linux. I've asked the ROOT team on Mattermost if anything changed in ROOT 6.36.06.

It was an unrelated issue.