update slot resume pointers for step 681

slots/0/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:0", "checkpoint": "slots/0/checkpoint-782", "step": 782, "updated_at": 1776398772}
+{"worker_id": "slot:0", "checkpoint": "slots/0/checkpoint-681", "step": 681, "updated_at": 1776399309}