Update app.py

app.py

@@ -4,7 +4,7 @@ from langchain_google_genai import GoogleGenerativeAIEmbeddings
 import google.generativeai as genai
 from langchain_community.vectorstores import FAISS
 from langchain_google_genai import ChatGoogleGenerativeAI
-from typings import Optional
+from typing import Optional
 
 genai.configure(api_key="AIzaSyD2o8vjePJb6z8vT_PVe82lVWMD3_cBL0g")