update slot resume pointers for step 7973

slots/15/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:15", "checkpoint": "slots/15/checkpoint-2597", "step": 2597, "updated_at": 1776406268}
+{"worker_id": "slot:15", "checkpoint": "slots/15/checkpoint-7973", "step": 7973, "updated_at": 1776417292}