update slot resume pointers for step 4863

slots/15/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:15", "checkpoint": "slots/15/checkpoint-3663", "step": 3663, "updated_at": 1776690718}
+{"worker_id": "slot:15", "checkpoint": "slots/15/checkpoint-4863", "step": 4863, "updated_at": 1776735752}