Enable Python 3.14 wheel builds and publishing

[blueraft]

This PR adds cp314 to the list of supported Python versions in the build configuration. This enables CI builds and wheel publishing for Python 3.14 on PyPI.

Tested in CI: https://github.com/blueraft/mdanalysis/actions/runs/18370481380

PR Checklist

• Issue raised/referenced?
• Tests updated/added?
• Documentation updated/added?
• package/CHANGELOG file updated?
• Is your name in package/AUTHORS? (If it is not, add it!)

Developers Certificate of Origin

I certify that I can submit this code contribution as described in the Developer Certificate of Origin, under the MDAnalysis LICENSE.

---

📚 Documentation preview 📚: https://mdanalysis--5120.org.readthedocs.build/en/5120/

[github-actions]

Hello there first time contributor! Welcome to the MDAnalysis community! We ask that all contributors abide by our Code of Conduct and that first time contributors introduce themselves on GitHub Discussions so we can get to know you. You can learn more about participating here. Please also add yourself to package/AUTHORS as part of this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.89%. Comparing base (c0685ac) to head (4a113c7).
⚠️ Report is 25 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #5120   +/-   ##
========================================
  Coverage    93.89%   93.89%           
========================================
  Files          180      180           
  Lines        22447    22447           
  Branches      3188     3188           
========================================
  Hits         21077    21077           
  Misses         902      902           
  Partials       468      468           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[IAlibay]

Thanks for opening this PR @blueraft - unfortunately this isn't the only CI file that needs changing and it's rather complicated to explain over a review.

I will take on doing this in a separate PR instead.

[blueraft]

No worries, thank you. I'll close this PR then

[IAlibay]

Sorry about this.

For context, here's the follow-up PR @blueraft - #5121

I'm expecting half the jobs to fail in some random unexpected manner, but please feel free to add comments/questions on that PR if you're looking to better understand the MDAnalysis CI.