gh-109706: Fix multiprocessing test_nested_startmethod() (#109707)

Don't check order, queue items can be written in any order.

Author: vstinner

Lib/test/_test_multiprocessing.py

@@ -5472,7 +5472,9 @@ def test_nested_startmethod(self):
         while not queue.empty():
             results.append(queue.get())
 
-        self.assertEqual(results, [2, 1])
+        # gh-109706: queue.put(1) can write into the queue before queue.put(2),
+        # there is no synchronization in the test.
+        self.assertSetEqual(set(results), set([2, 1]))
 
 
 @unittest.skipIf(sys.platform == "win32",