Upload shared/checkpoints/owner_backup_latest.json with huggingface_hub

shared/checkpoints/owner_backup_latest.json

@@ -1 +1 @@
-{"owner_worker_id": "worker-8742c570", "checkpoint": "shared/checkpoints/checkpoint-642", "checkpoint_name": "checkpoint-642", "step": 642, "updated_at": 1778383434, "status": "owner_backup_ok"}
+{"owner_worker_id": "worker-8742c570", "checkpoint": "shared/checkpoints/checkpoint-648", "checkpoint_name": "checkpoint-648", "step": 648, "updated_at": 1778383853, "status": "owner_backup_ok"}