test: mark win32 failure test

Lib/test/test_weakref.py

@@ -2050,6 +2050,7 @@ class FinalizeTestCase(unittest.TestCase):
         assert f3.atexit == True
         assert f4.atexit == True
 
+    @unittest.skipIf(sys.platform == 'win32', 'TODO: RUSTPYTHON Windows')
     def test_atexit(self):
         prog = ('from test.test_weakref import FinalizeTestCase;'+
                 'FinalizeTestCase.run_in_child()')