Leave test.support dependency for now

This is not strictly required for the current workflow to work so might
as well keep the status quo

Author: brianschubert

src/test_typing_extensions.py

@@ -8844,12 +8844,9 @@ def test_name_lookup_without_eval(self):
         self.assertIs(evaluate_forward_ref(typing.ForwardRef("int"), globals={"int": str}), str)
         import builtins
 
-        real_int = builtins.int
-        try:
-            builtins.int = dict
+        from test import support
+        with support.swap_attr(builtins, "int", dict):
             self.assertIs(evaluate_forward_ref(typing.ForwardRef("int")), dict)
-        finally:
-            builtins.int = real_int
 
     def test_nested_strings(self):
         # This variable must have a different name TypeVar