[fix] Corrections ruff CI (UP017/UP041/UP012/I001/F401/FURB162) : backend/admin.py

backend/admin.py

@@ -10,7 +10,7 @@ import logging
 import os
 import shutil
 import time
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from pathlib import Path
 from typing import Any
 
@@ -244,7 +244,7 @@ def _build_stats_payload() -> dict:
         "disk_used_gb": disk_used_gb,
         "disk_total_gb": disk_total_gb,
         "uptime_seconds": int(_server_uptime_seconds()),
-        "timestamp": datetime.now(timezone.utc).isoformat(),
+        "timestamp": datetime.now(UTC).isoformat(),
     }