Remove flaky part of test.

ZeroIntensity · ZeroIntensity · commit 34b8b7ebd83d · 2025-09-18T10:21:19.000-04:00
diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
@@ -2107,7 +2107,6 @@ def test():
             proc.stderr.flush()
             error = proc.stderr.read()
             self.assertIn(b"KeyboardInterrupt", error)
-            self.assertIn(b"threading shutdown", error)
 
 
 class ThreadRunFail(threading.Thread):
