update slot resume pointers for step 7428

slots/7/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:7", "checkpoint": "slots/7/checkpoint-3207", "step": 3207, "updated_at": 1776407423}
+{"worker_id": "slot:7", "checkpoint": "slots/7/checkpoint-7428", "step": 7428, "updated_at": 1776416414}