pydantic upgrade

[michaelfeil]

• Makes usage with pydantic v1 possible (beta), this helps usage in langchain.
• makes openai post request acceppt a single string instead of a list of strings

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (13458f7) 86.25% compared to head (b858f32) 86.18%.

Files	Patch %	Lines
...inity_emb/infinity_emb/fastapi_schemas/pymodels.py	72.72%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #100      +/-   ##
==========================================
- Coverage   86.25%   86.18%   -0.08%     
==========================================
  Files          27       27              
  Lines        1266     1274       +8     
==========================================
+ Hits         1092     1098       +6     
- Misses        174      176       +2     

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[michaelfeil]

Should be compatible now with langchain-ai/langchain#17671