python: unpin python 3.14

[tmorrell]

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Description

Now that inveniosoftware/pytest-invenio#134 is merged across all the rdm repositories, it should be safe to unpin python 3.14. Tests pass unpinned in rdm-records https://github.com/caltechlibrary/invenio-rdm-records/actions/runs/21647962183

Checklist

Ticks in all boxes and 🟢 on all GitHub actions status checks are required to merge:

• I'm aware of the code of conduct.
• I've created logical separate commits and followed the commit message format.
• I've added relevant test cases.
• I've added relevant documentation.
• I've marked translation strings.
• I've identified the copyright holder(s) and updated copyright headers for touched files (>15 lines contributions).
• I've NOT included third-party code (copy/pasted source code or new dependencies).
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