removed unneeded import

Author: daniel-sanche

tests/system/v2_client/test_data_api.py

@@ -233,7 +233,6 @@ def test_table_read_row_large_cell(data_table, rows_to_delete, skip_on_emulator)
 def _write_to_row(row1, row2, row3, row4):
     from google.cloud._helpers import _datetime_from_microseconds
     from google.cloud._helpers import _microseconds_from_datetime
-    from google.cloud._helpers import UTC
     from google.cloud.bigtable.row_data import Cell
 
     timestamp1 = datetime.datetime.now(datetime.UTC)

tests/unit/v2_client/test_backup.py

@@ -19,7 +19,6 @@
 import pytest
 
 from ._testing import _make_credentials
-from google.cloud._helpers import UTC
 
 PROJECT_ID = "project-id"
 INSTANCE_ID = "instance-id"

tests/unit/v2_client/test_table.py

@@ -1378,7 +1378,6 @@ def test_table_backup_factory_defaults():
 
 def test_table_backup_factory_non_defaults():
     import datetime
-    from google.cloud._helpers import UTC
     from google.cloud.bigtable.backup import Backup
     from google.cloud.bigtable.instance import Instance