bpo-40275: Use new test.support helper submodules in tests (GH-21451)

diff --git a/Lib/test/test_venv.py b/Lib/test/test_venv.py
index ca003d5..5bb62cd 100644
--- a/Lib/test/test_venv.py
+++ b/Lib/test/test_venv.py
@@ -15,9 +15,8 @@
 import sys
 import tempfile
 from test.support import (captured_stdout, captured_stderr, requires_zlib,
-                          can_symlink, EnvironmentVarGuard, rmtree,
-                          import_module,
                           skip_if_broken_multiprocessing_synchronize)
+from test.support.os_helper import (can_symlink, EnvironmentVarGuard, rmtree)
 import unittest
 import venv
 from unittest.mock import patch