Update app.py

app.py

@@ -6,7 +6,7 @@ from io import BytesIO
 from datetime import datetime
 from typing import List, Optional
 import hashlib
-from fastapi.response import RedirectResponses
+from fastapi.responses import RedirectResponse
 import chromadb
 from chromadb.utils import embedding_functions
 from fastapi import FastAPI, UploadFile, HTTPException, BackgroundTasks, Depends