force gradio version

app.py

@@ -2,6 +2,9 @@ import gradio as gr
 from typing import Dict, List, Optional, TypedDict
 from nlp4web_codebase.ir.data_loaders.sciq import load_sciq
 from bm25 import BM25Index, BM25Retriever
+import os
+
+os.system("pip install gradio==4.44.0")
 
 sciq = load_sciq()
 bm25_index = BM25Index.build_from_documents(