update slot resume pointers for step 3419

slots/18/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:18", "checkpoint": "slots/18/checkpoint-3003", "step": 3003, "updated_at": 1776688225}
+{"worker_id": "slot:18", "checkpoint": "slots/18/checkpoint-3419", "step": 3419, "updated_at": 1776689832}