update slot resume pointers for step 4538

slots/0/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:0", "checkpoint": "slots/0/checkpoint-4078", "step": 4078, "updated_at": 1776692381}
+{"worker_id": "slot:0", "checkpoint": "slots/0/checkpoint-4538", "step": 4538, "updated_at": 1776734924}