Update app.py

app.py

@@ -1,7 +1,7 @@
 import json
 import os
 from functools import lru_cache
-from typing import List, Tuple
+from typing import List, Optional, Tuple
 
 import gradio as gr
 from huggingface_hub import HfApi, hf_hub_download
@@ -41,7 +41,7 @@ def _list_collection_files(pr_number: str) -> Tuple[str, ...]:
     return tuple(files)
 
 
-def _load_payload(path: str) -> dict | None:
+def _load_payload(path: str) -> Optional[dict]:
     try:
         local_path = hf_hub_download(
             repo_id=DATASET_ID,