update slot resume pointers for step 499

slots/8/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:8", "checkpoint": "slots/8/checkpoint-472", "step": 472, "updated_at": 1776387609}
+{"worker_id": "slot:8", "checkpoint": "slots/8/checkpoint-499", "step": 499, "updated_at": 1776388918}