update slot resume pointers for step 7879

slots/8/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:8", "checkpoint": "slots/8/checkpoint-5758", "step": 5758, "updated_at": 1776413235}
+{"worker_id": "slot:8", "checkpoint": "slots/8/checkpoint-7879", "step": 7879, "updated_at": 1776417355}