Remove expectedFailure from test_default_annotations_exist

Lib/test/test_opcodes.py

@@ -33,8 +33,6 @@ class OpcodeTest(unittest.TestCase):
         except OSError:
             pass
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_default_annotations_exist(self):
         class C: pass
         self.assertEqual(C.__annotations__, {})