Update app.py

app.py

@@ -3,7 +3,7 @@ import gc
 import io
 from llama_cpp import Llama
 from concurrent.futures import ThreadPoolExecutor, as_completed
-from fastapi import FastAPI, Request, HTTPException, Lifespan
+from fastapi import FastAPI, Request, HTTPException
 from fastapi.responses import JSONResponse
 from tqdm import tqdm
 from dotenv import load_dotenv