fixed linting issues

backend/tests/test_admin.py

@@ -1,11 +1,9 @@
-import pytest
 from fastapi import status
 from fastapi.testclient import TestClient
 from sqlalchemy.orm import Session
 from unittest.mock import patch
 
 from tests.helpers import generators
-from modules.auth.models import UserRole
 
 # Test admin routes require admin privileges