Update test_sys per review

Author: brianschubert

Lib/test/test_sys.py

@@ -1897,8 +1897,7 @@ def test_pythontypes(self):
         check = self.check_sizeof
         # _ast.AST
         import _ast
-        with self.assertWarns(DeprecationWarning):
-            check(_ast.AST(), size('P'))
+        check(_ast.Module(), size('3P'))
         try:
             raise TypeError
         except TypeError as e: