Issue #23641: Added __getnewargs_ex__ to the list of special mock attributes.

Lib/unittest/mock.py

@@ -1694,6 +1694,7 @@ _non_defaults = {
     '__reduce__', '__reduce_ex__', '__getinitargs__', '__getnewargs__',
     '__getstate__', '__setstate__', '__getformat__', '__setformat__',
     '__repr__', '__dir__', '__subclasses__', '__format__',
+    '__getnewargs_ex__',
 }