Fix the missing temperature parameter for Baichuan-AI chat_model (#12420)

**Description:** the missing `temperature` parameter for Baichuan-AI
chat_model

Baichuan-AI api doc: https://platform.baichuan-ai.com/docs/api

libs/langchain/langchain/chat_models/baichuan.py

@@ -186,6 +186,7 @@ class ChatBaichuan(BaseChatModel):
         """Get the default parameters for calling Baichuan API."""
         normal_params = {
             "model": self.model,
+            "temperature": self.temperature,
             "top_p": self.top_p,
             "top_k": self.top_k,
             "with_search_enhance": self.with_search_enhance,