fix ci issue (#3245)

### What problem does this PR solve?


### Type of change

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

sdk/python/test/t_session.py

     assistant = rag.create_chat("test_create_conversation", dataset_ids=[kb.id])
     session = assistant.create_session()
     question = "What is AI"
-    for ans in session.ask(question, stream=True):
+    for ans in session.ask(question):
         pass
     
     # assert not ans.content.startswith("**ERROR**"), "Please check this error."