Update app.py

app.py

@@ -256,7 +256,7 @@ async def github_webhook(
     initial_state = PRReviewState(**initial_state_data)
     
     try:
-        for s in global_graph.stream({initial_state}, {"configurable": {"thread_id": new_thread_id}}):
+        for s in global_graph.stream(initial_state, {"configurable": {"thread_id": new_thread_id}}):
             if "__end__" in s:
                 break
             elif "__interrupt__" in s: