bpo-40275: Use new test.support helper submodules in tests (GH-21412)

diff --git a/Lib/test/test_xxtestfuzz.py b/Lib/test/test_xxtestfuzz.py
index 15924aa..3304c6e 100644
--- a/Lib/test/test_xxtestfuzz.py
+++ b/Lib/test/test_xxtestfuzz.py
@@ -1,8 +1,8 @@
 import faulthandler
-import test.support
+from test.support import import_helper
 import unittest
 
-_xxtestfuzz = test.support.import_module('_xxtestfuzz')
+_xxtestfuzz = import_helper.import_module('_xxtestfuzz')
 
 
 class TestFuzzer(unittest.TestCase):