free threading: do not enable GIL

[methane]

fix #766

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.84%. Comparing base (e2a908b) to head (1aa6778).
⚠️ Report is 33 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #775      +/-   ##
==========================================
- Coverage   88.86%   88.84%   -0.02%     
==========================================
  Files           7        7              
  Lines         548      556       +8     
==========================================
+ Hits          487      494       +7     
- Misses         61       62       +1     

☔ 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.