update slot resume pointers for step 4621

slots/10/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:10", "checkpoint": "slots/10/checkpoint-1525", "step": 1525, "updated_at": 1776683305}
+{"worker_id": "slot:10", "checkpoint": "slots/10/checkpoint-4621", "step": 4621, "updated_at": 1776735117}