Remove unused import

Author: vstinner

Lib/test/test_locale.py

@@ -1,7 +1,6 @@
 from decimal import Decimal
 from test import support
 from test.support import cpython_only, verbose, is_android, linked_to_musl, os_helper
-from test.support.warnings_helper import check_warnings
 from test.support.import_helper import ensure_lazy_imports, import_fresh_module
 from unittest import mock
 import unittest