update slot resume pointers for step 3869

slots/9/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:9", "checkpoint": "slots/9/checkpoint-3206", "step": 3206, "updated_at": 1776689003}
+{"worker_id": "slot:9", "checkpoint": "slots/9/checkpoint-3869", "step": 3869, "updated_at": 1776691588}