[Enum] update version TODO comment (GH-99458)

(cherry picked from commit db11568)

Co-authored-by: Ethan Furman <[email protected]>

Author: miss-islington

Lib/enum.py

@@ -414,7 +414,7 @@ def __setitem__(self, key, value):
             value = value.value
         elif _is_descriptor(value):
             pass
-        # TODO: uncomment next three lines in 3.12
+        # TODO: uncomment next three lines in 3.13
         # elif _is_internal_class(self._cls_name, value):
         #     # do nothing, name will be a normal attribute
         #     pass