Upgrade to Python 3.14 and msgspec 0.20.0

Dan Notesteinrequested to merge
feature/python-3.14-msgspec-0.20 into master

Summary

  • Upgrade to Python 3.14 ci-base-image
  • Upgrade msgspec to 0.20.0 for Python 3.14 support
  • Fix mypy type: ignore comments for Python 3.14
  • Add poetry lock regeneration for CI

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