pythongh-124402: Require cpu resource in test_super slow method (pyth…

…on#124434)

test___class___modification_multithreaded() now requires the 'cpu'
test resource on a Free Threaded build.

Lib/test/test_super.py

@@ -4,6 +4,7 @@
 import threading
 import unittest
 from unittest.mock import patch
+from test import support
 from test.support import import_helper, threading_helper
 
 
@@ -513,6 +514,11 @@ def test___class___modification_multithreaded(self):
         This should be the case anyways as our test suite sets
         an audit hook.
         """
+
+        if support.Py_GIL_DISABLED:
+            # gh-124402: On a Free Threaded build, the test takes a few minutes
+            support.requires('cpu')
+
         class Foo:
             pass