PHP 8.1.6 compatibility #90

Tested on PHP 8.1.6 but it gets return type deprecated warning due to the interface SessionHandlerInterface.
Sorry I only got this in Spanish

[28-Dic-2022 09:01:53 UTC] PHP Deprecated: El tipo de retorno de EAMann\Sessionz\Manager::open($save_path, $name) debería ser compatible con SessionHandlerInterface::open(string $path, string $name): bool, o debería usarse el atributo #[\ReturnTypeWillChange] para suprimir temporalmente