fix chatbot

Author: piyushroshan

services/chatbot/src/chatbot/langgraph_agent.py

@@ -17,7 +17,7 @@
 from langgraph.graph.message import add_messages
 from langgraph.prebuilt import create_react_agent
 from chromadb.config import DEFAULT_TENANT, DEFAULT_DATABASE, Settings
-
+from .retrieverutils import get_retriever_tool
 
 from .extensions import postgresdb
 from .config import Config