🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Author: gcf-owl-bot[bot]

pandas_gbq/schema/bigquery_to_pyarrow.py

@@ -2,12 +2,12 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
-import warnings
 from typing import Any, Union
+import warnings
 
 import db_dtypes
-import pyarrow
 from google.cloud import bigquery
+import pyarrow
 
 
 def pyarrow_datetime():

tests/unit/schema/test_bigquery_to_pyarrow.py

@@ -19,10 +19,10 @@
 import functools
 import warnings
 
-import pyarrow
-import pytest
 from google.cloud import bigquery
 from google.cloud.bigquery import schema
+import pyarrow
+import pytest
 
 
 @pytest.fixture