Update editors.

        DEPRECATED:  use ``policy["roles/editors"] = value`` instead.

def editors(self, value):
        """Update editors.

        DEPRECATED:  use ``policy["roles/editors"] = value`` instead."""
        warnings.warn(
            _ASSIGNMENT_DEPRECATED_MSG.format("editors", EDITOR_ROLE),
            DeprecationWarning,
        )
        self[EDITOR_ROLE] = value