Bump pyzmq to 27.2.0 for free-threaded Python 3.15 wheels

[blink1073]

References

Fixes the Test (Python 3.15t) failure in https://github.com/Calysto/metakernel/actions/runs/32607477560

Description

The nightly Test (Python 3.15t) job fails while installing dependencies. pyzmq 27.1.0 ships no cp315t wheel, so Poetry falls back to the sdist, and Cython rejects those sources with 'hint' redeclared and 'c_addr' redeclared. pyzmq 27.2.0 ships a cp315t wheel, so nothing is built from source.

Changes

• Bumped pyzmq from 27.1.0 to 27.2.0 in poetry.lock.

Backwards-incompatible changes

None

Testing

• just test: 498 passed, 69 skipped.
• just typing: no issues in 114 source files.
• just lint: all hooks passed.
• The free-threaded 3.15 path can only be exercised in CI.

AI usage

• Some or all of the content of this PR was generated by AI.
• The human author has carefully reviewed this PR and run this code. Pending author review.
• AI tools and models used: Claude Code (Opus 5)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.56%. Comparing base (567b739) to head (7f44746).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #480   +/-   ##
=======================================
  Coverage   93.56%   93.56%           
=======================================
  Files          51       51           
  Lines        2982     2982           
  Branches      414      414           
=======================================
  Hits         2790     2790           
  Misses        129      129           
  Partials       63       63           

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