update slot resume pointers for step 6264

slots/16/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:16", "checkpoint": "slots/16/checkpoint-5727", "step": 5727, "updated_at": 1776440093}
+{"worker_id": "slot:16", "checkpoint": "slots/16/checkpoint-6264", "step": 6264, "updated_at": 1776441342}