Remove obsolete Literal deduplication assertion

Author: AlexWaygood

src/test_typing_extensions.py

@@ -1337,8 +1337,6 @@ def test_args(self):
         self.assertEqual(Literal[1, 2, 3].__args__, (1, 2, 3))
         self.assertEqual(Literal[1, 2, 3, 3].__args__, (1, 2, 3))
         self.assertEqual(Literal[1, Literal[2], Literal[3, 4]].__args__, (1, 2, 3, 4))
-        # Mutable arguments will not be deduplicated
-        self.assertEqual(Literal[[], []].__args__, ([], []))
 
     def test_union_of_literals(self):
         self.assertEqual(Union[Literal[1], Literal[2]].__args__,