Use UserWarning from pyo3

[changhc]

Change Summary

Following David's comment: #1551 (review)

Replacing the explicitly imported python UserWarning with PyUserWarning from pyo3. This might slightly improve performance in this case, depending on how pyo3 actually raises warnings. In the worst case it should be the same as the current implementation, so there's no harm doing this.

Related issue number

None.

Checklist

• Unit tests for the changes exist
• Documentation reflects the changes where applicable
• Pydantic tests pass with this pydantic-core (except for expected changes)
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

Selected Reviewer: @sydney-runkle

[codspeed-hq]

CodSpeed Performance Report

Merging #1559 will not alter performance

_{Comparing changhc:user-warning (5630fa4) with main (ab0e4bd)}

Summary

✅ 155 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.63%. Comparing base (ab503cb) to head (5630fa4).
Report is 249 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1559      +/-   ##
==========================================
- Coverage   90.21%   89.63%   -0.59%     
==========================================
  Files         106      112       +6     
  Lines       16339    17889    +1550     
  Branches       36       40       +4     
==========================================
+ Hits        14740    16034    +1294     
- Misses       1592     1835     +243     
- Partials        7       20      +13     

Files with missing lines	Coverage Δ
src/serializers/extra.rs	96.56% <100.00%> (-2.97%)	⬇️

... and 57 files with indirect coverage changes

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[changhc]

please review

[davidhewitt]

Thanks for following up 👍