Plugin triggers warning on PHP 8

[pacmanito]

Hi, after switching my local WP to PHP 8 I see following in logs:

Warning: Private methods cannot be final as they are never overridden by other classes in \wp-content\plugins\dashboard-cleanup-1.1.2\helpers\boot.php on line 50

Warning: Private methods cannot be final as they are never overridden by other classes in \wp-content\plugins\dashboard-cleanup-1.1.2\helpers\singleton.php on line 76

I suppose switching
final private function __clone() {}
to
final protected function __clone() {}
should solve the issue