webhook fix

app.py

@@ -11,7 +11,7 @@ import tempfile
 import threading
 from datetime import datetime, timezone
 
-from huggingface_hub import HfApi, WebhooksServer
+from huggingface_hub import HfApi, WebhookPayload, WebhooksServer
 from huggingface_hub import hf_hub_download
 from huggingface_hub.utils import EntryNotFoundError
 
@@ -345,7 +345,7 @@ def _extract_pr_nums_from_refs(payload) -> list[int]:
     return pr_nums
 
 
-async def validate(payload):
+async def validate(payload: WebhookPayload):
     """Handle incoming webhook events from HuggingFace."""
     logger.info("Received webhook event: %s", payload.event)