update slot resume pointers for step 7859

slots/9/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:9", "checkpoint": "slots/9/checkpoint-4665", "step": 4665, "updated_at": 1776735091}
+{"worker_id": "slot:9", "checkpoint": "slots/9/checkpoint-7859", "step": 7859, "updated_at": 1776774370}