update slot resume pointers for step 488

slots/9/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:9", "checkpoint": "slots/9/checkpoint-418", "step": 418, "updated_at": 1776360395}
+{"worker_id": "slot:9", "checkpoint": "slots/9/checkpoint-488", "step": 488, "updated_at": 1776387906}