Matheus Resende

Closes #156

Update syntax to php 8.4

1

Implicitly nullable parameter types are deprecated in PHP 8.4: https://wiki.php.net/rfc/deprecate-implicitly-nullable-types

update syntax to php 8.4

2

Closes #58

PHP 8.4 introduces a deprecation warning when a parameter is defined with a default null value but is not explicitly declared as nullable