update to PyO3 0.19.0

[davidhewitt]

Bumps version of PyO3 to 0.19.0, making the required fixups and adopting use of the new PyList::to_tuple method.

Are there any other features which you were waiting for from the new PyO3?

[codecov-commenter]

Codecov Report

Merging #658 (1f3dc4d) into main (0fe0936) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #658      +/-   ##
==========================================
- Coverage   93.89%   93.83%   -0.07%     
==========================================
  Files          99       99              
  Lines       13765    13756       -9     
  Branches       25       25              
==========================================
- Hits        12925    12908      -17     
- Misses        834      842       +8     
  Partials        6        6              

Impacted Files	Coverage Δ
src/input/input_python.rs	98.31% <100.00%> (-0.05%)	⬇️
src/serializers/type_serializers/function.rs	96.14% <100.00%> (+0.27%)	⬆️

... and 1 file with indirect coverage changes

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[codspeed-hq]

CodSpeed Performance Report

Merging #658 davidhewitt:pyo3-0.19 (1f3dc4d) will not alter performances.

Summary

🔥 0 improvements
❌ 0 regressions
✅ 125 untouched benchmarks

🆕 0 new benchmarks
⁉️ 0 dropped benchmarks

[samuelcolvin]

Thanks so much, nothing else I know of.