Fix OpenAPI client for endpoints with uppercase Query variables

[rjambrecic]

@app.get("/gifs", response_model=list[Gif], tags=["gifs"])
def get_gifs_for_topic(topic: str = fastapi.Query(..., alias="Topic")) -> list[Gif]:
    """Get GIFs for a topic."""
    return [
        Gif(id=1, title="Gif 1", url=f"https://gif.example.com/gif1?topic={topic}"),
        Gif(id=2, title="Gif 2", url=f"https://gif.example.com/gif2?topic={topic}"),
    ]

Tool call error:

***** Suggested tool call (call_8X6Nbo0sCpGgg9oxYUKA0U2w): get_gifs_for_topic_gifs_get *****
Arguments: 
{
  "topic": "funny"
}
********************************************************************************************

--------------------------------------------------------------------------------

>>>>>>>> EXECUTING FUNCTION get_gifs_for_topic_gifs_get...
INFO:     127.0.0.1:36802 - "GET /gifs?topic=funny HTTP/1.1" 422 Unprocessable Entity
user_proxy (to agent):

user_proxy (to agent):

***** Response from calling tool (call_8X6Nbo0sCpGgg9oxYUKA0U2w) *****
{"detail": [{"type": "missing", "loc": ["query", "Topic"], "msg": "Field required", "input": null}]}
**********************************************************************