update slot resume pointers for step 8142

slots/2/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:2", "checkpoint": "slots/2/checkpoint-5705", "step": 5705, "updated_at": 1776439987}
+{"worker_id": "slot:2", "checkpoint": "slots/2/checkpoint-8142", "step": 8142, "updated_at": 1776469397}