Fix bad imports

app.py

@@ -6,7 +6,7 @@ from llama_index import (
     download_loader,
 )
 import chromadb
-from typing import TypedDict
+import typing_extensions
 from fastapi import FastAPI, File, UploadFile, Request
 from fastapi.responses import JSONResponse
 
@@ -54,7 +54,7 @@ query_engine = index.as_query_engine(similarity_top_k=5)
 app = FastAPI()
 
 # Structure of the data sent by the form
-InputForm = TypedDict('InputForm', {
+InputForm = typing_extensions.TypedDict('InputForm', {
   'department': str,
   'farmSize': float,
   'benefitsFromCommonAgriculturalPolicy': bool,