Add Python 3.14t (freethreaded) to testing matrix

[vinitkumar]

• Added Python 3.14t to the test matrix
• Python 3.14.0 freethreaded is available on all platforms (Ubuntu, Windows, macOS)
• Tests will run on all supported OS and architectures

Summary by Sourcery

CI:

• Add Python 3.14t to the python-version matrix in GitHub Actions workflow

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The GitHub Actions workflow is updated to extend the test matrix with the new Python 3.14t (freethreaded) interpreter, ensuring it runs across all supported operating systems alongside existing interpreters.

File-Level Changes

Change	Details	Files
Add Python 3.14t to the GitHub Actions test matrix	Insert '3.14t' into the python-version list Maintain coverage for pypy-3.10, pypy-3.11 and CPython 3.10–3.14 Continue running matrix jobs on ubuntu-latest, windows-latest, and macOS	.github/workflows/pythonpackage.yml

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.30%. Comparing base (fd0ad4c) to head (9ff9d91).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #251   +/-   ##
=======================================
  Coverage   99.30%   99.30%           
=======================================
  Files           3        3           
  Lines         288      288           
=======================================
  Hits          286      286           
  Misses          2        2           

Flag	Coverage Δ
unittests	99.30% <ø> (ø)

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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