remove some redundant python reference count ops

[davidhewitt]

Avoiding the .to_object() calls just avoids reference count going up & back down needlessly.

[codspeed-hq]

CodSpeed Performance Report

Merging #68 will not alter performance

_{Comparing dh/python-cleanups (a6b952e) with main (0897da4)}

Summary

✅ 54 untouched benchmarks

[codecov]

Codecov Report

Merging #68 (a6b952e) into main (0897da4) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #68   +/-   ##
=======================================
  Coverage   95.49%   95.49%           
=======================================
  Files           8        8           
  Lines        1110     1110           
=======================================
  Hits         1060     1060           
  Misses         50       50           

Files	Coverage Δ
src/python.rs	95.12% <100.00%> (ø)

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[sydney-runkle]

Nice :).