Fix: Bedrock model invocation error. (#6533)

### What problem does this PR solve?


### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/llm/chat_model.py

     def chat(self, system, history, gen_conf):
         from botocore.exceptions import ClientError
         for k in list(gen_conf.keys()):
-            if k not in ["top_p", "max_tokens"]:
+            if k not in ["temperature"]:
                 del gen_conf[k]
         for item in history:
             if not isinstance(item["content"], list) and not isinstance(item["content"], tuple):
     def chat_streamly(self, system, history, gen_conf):
         from botocore.exceptions import ClientError
         for k in list(gen_conf.keys()):
-            if k not in ["top_p", "max_tokens"]:
+            if k not in ["temperature"]:
                 del gen_conf[k]
         for item in history:
             if not isinstance(item["content"], list) and not isinstance(item["content"], tuple):