update slot resume pointers for step 6648

slots/17/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:17", "checkpoint": "slots/17/checkpoint-5462", "step": 5462, "updated_at": 1776440017}
+{"worker_id": "slot:17", "checkpoint": "slots/17/checkpoint-6648", "step": 6648, "updated_at": 1776442795}