correct PyO3 feature usage

[davidhewitt]

Should fix #125

[codspeed-hq]

CodSpeed Performance Report

Merging #126 will not alter performance

_{Comparing pyo3-features (3233d3d) with main (8cd4497)}

Summary

✅ 73 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.92%. Comparing base (8cd4497) to head (3233d3d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #126   +/-   ##
=======================================
  Coverage   94.92%   94.92%           
=======================================
  Files          12       12           
  Lines        1910     1910           
=======================================
  Hits         1813     1813           
  Misses         97       97           

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8cd4497...3233d3d. Read the comment docs.

[samuelcolvin]

Thanks so much, I'll fix up and merge soon.