changes callback_manager to callbacks

pipeline.py

@@ -192,8 +192,6 @@ CACHE_SIZE_LIMIT = 1000
 #     raise RuntimeError("ChatGroq initialization failed.") from e
 
 
-from langchain_core.callbacks import CallbackManager
-from langchain_core.callbacks.base import BaseCallbackHandler
 
 ChatGroq.model_rebuild()
 
@@ -205,7 +203,7 @@ try:
         temperature=0.7,
         groq_api_key=fallback_groq_api_key,
         max_tokens=2048,
-         callback_manager=CallbackManager([])  # Add the callback manager here
+        callbacks=[]  # Add the callback manager here
     )