update slot resume pointers for step 4078

slots/0/latest.json

@@ -1 +1 @@
-{"worker_id": "slot:0", "checkpoint": "slots/0/checkpoint-3338", "step": 3338, "updated_at": 1776689463}
+{"worker_id": "slot:0", "checkpoint": "slots/0/checkpoint-4078", "step": 4078, "updated_at": 1776692381}