update slot resume pointers for step 4689

slots/16/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:16", "checkpoint": "slots/16/checkpoint-1731", "step": 1731, "updated_at": 1776684158}
+{"worker_id": "slot:16", "checkpoint": "slots/16/checkpoint-4689", "step": 4689, "updated_at": 1776735493}