HandyLLM v0.9.3

Release HandyLLM v0.9.3.

Fixed

• Due to the change in httpx==0.28.0 (see its CHANGELOG), the request params cannot be {} as it will override the original query params. This will cause errors like 404 Resource Not Found, when the api-version parameter in Azure endpoint is overridden. Now when params is an empty dictionary, it will be passed as the default None. See httpx PR 3364 and Issue 3433.