bpo-40275: Use new test.support helper submodules in tests (GH-21743)

diff --git a/Lib/test/test_winsound.py b/Lib/test/test_winsound.py
index dca77cb..3c3359b 100644
--- a/Lib/test/test_winsound.py
+++ b/Lib/test/test_winsound.py
@@ -5,9 +5,11 @@
 import unittest
 
 from test import support
+from test.support import import_helper
+
 
 support.requires('audio')
-winsound = support.import_module('winsound')
+winsound = import_helper.import_module('winsound')
 
 
 # Unless we actually have an ear in the room, we have no idea whether a sound