chore: Switch back to PyO3 0.22

[itamarst]

Now that much more of the Python API releases the GIL, the chance of deadlocks is lower and it seems worth upgrading to 0.22 again (especially since 0.23 was just released, and that is going to be its own whole thing...).

This reverts commit e1dfcdd.

[codecov]

Codecov Report

Attention: Patch coverage is 70.58824% with 5 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@f893f75). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
crates/polars-python/src/file.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #19851   +/-   ##
=======================================
  Coverage        ?   79.40%           
=======================================
  Files           ?     1550           
  Lines           ?   214919           
  Branches        ?     2447           
=======================================
  Hits            ?   170661           
  Misses          ?    43701           
  Partials        ?      557           

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