update slot resume pointers for step 8170

slots/1/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:1", "checkpoint": "slots/1/checkpoint-7738", "step": 7738, "updated_at": 1776773905}
+{"worker_id": "slot:1", "checkpoint": "slots/1/checkpoint-8170", "step": 8170, "updated_at": 1776775650}