fix: set python>=3.11,<3.14

[ycexiao]

What problem does this PR address?

The release workflow fails because diffpy.cmi doesn't support python=3.14 https://github.com/diffpy/diffpy.apps/actions/runs/25756923231

What should the reviewer(s) do?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.11%. Comparing base (7294cb6) to head (3ef3906).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #24   +/-   ##
=======================================
  Coverage   94.11%   94.11%           
=======================================
  Files           5        5           
  Lines         187      187           
=======================================
  Hits          176      176           
  Misses         11       11           

🚀 New features to boost your workflow:

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

[ycexiao]

@sbillinge, it's ready for review.