update slot resume pointers for step 477

slots/1/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:1", "checkpoint": "slots/1/checkpoint-424", "step": 424, "updated_at": 1776360666}
+{"worker_id": "slot:1", "checkpoint": "slots/1/checkpoint-477", "step": 477, "updated_at": 1776387394}