chore: reformat the codes using autoformat.sh

PiperOrigin-RevId: 762004002

tests/unittests/artifacts/test_artifact_service.py

@@ -17,12 +17,11 @@
 import enum
 from typing import Optional
 from typing import Union
+from unittest import mock
 
 from google.adk.artifacts import GcsArtifactService
 from google.adk.artifacts import InMemoryArtifactService
 from google.genai import types
-
-from unittest import mock
 import pytest
 
 Enum = enum.Enum