fix lint

Author: wu-clan

backend/app/admin/model/data_rule.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
-from sqlalchemy import ForeignKey, String
+from sqlalchemy import String
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from backend.app.admin.model.m2m import sys_role_data_rule