fix union response type

[ponytailer]

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[codecov-commenter]

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Codecov Report

❌ Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.42%. Comparing base (218660c) to head (54705b7).

Files with missing lines	Patch %	Lines
pydantic_client/async_client.py	66.66%	2 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #145      +/-   ##
==========================================
- Coverage   88.59%   88.42%   -0.18%     
==========================================
  Files           8        8              
  Lines         491      501      +10     
==========================================
+ Hits          435      443       +8     
- Misses         56       58       +2     

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