bpo-40275: Use new test.support helper submodules in tests (GH-21764)

diff --git a/Lib/sqlite3/test/hooks.py b/Lib/sqlite3/test/hooks.py
index d74e74b..b08adf1 100644
--- a/Lib/sqlite3/test/hooks.py
+++ b/Lib/sqlite3/test/hooks.py
@@ -24,7 +24,8 @@
 import unittest
 import sqlite3 as sqlite
 
-from test.support import TESTFN, unlink
+from test.support.os_helper import TESTFN, unlink
+
 
 class CollationTests(unittest.TestCase):
     def CheckCreateCollationNotString(self):