fix: import utc

Author: dori

src/mcp_as_a_judge/db/providers/sqlite_provider.py

@@ -5,8 +5,8 @@
 It supports both in-memory (:memory:) and file-based SQLite storage.
 """
 
-import uuid
 from datetime import datetime, UTC
+import uuid
 
 from sqlalchemy import create_engine
 from sqlmodel import Session, SQLModel, asc, desc, select