Fix timeout problem

chatbot/retrieval.py

@@ -45,7 +45,8 @@ def get_vector_db():
         location=qdrant_url,
         collection_name=collection_name,
         api_key=api_key,
-        timeout=None
+        port=None,       # Avoid appending default port 6333
+        timeout=20
     )
     return vector_db