Update app.py

app.py

@@ -27,7 +27,7 @@ from langchain_community.document_loaders import (
 from langchain_community.graphs import Neo4jGraph
 from langchain_community.vectorstores import Neo4jVector
 from langchain_experimental.graph_transformers import LLMGraphTransformer
-from langchain.chains.graph_qa.cypher import GraphCypherQAChain
+from langchain_community.chains.graph_qa.cypher import GraphCypherQAChain
 
 # --- LLMs & Embeddings: Cohere or Gemini ---
 # Cohere