Update app.py

app.py

@@ -6,7 +6,7 @@ from langchain_community.embeddings import OpenAIEmbeddings
 from langchain_community.vectorstores import FAISS
 from langchain.chains import ConversationalRetrievalChain
 from langchain.memory import ConversationBufferMemory
-from langchain_openai import ChatOpenAI
+from langchain_openai.chat_models import ChatOpenAI
 
 class AuditCopilot:
     def __init__(self):