PHP 8.4 Deprecation warning nullable $name

[mk-conn]

Hey,

following deprecation warning pops up:

PHP Deprecated:  Phlib\ConsoleProcess\Command\BackgroundCommand::__construct(): Implicitly marking parameter $name as nullable is deprecated, the explicit nullable type must be used instead in .../vendor/phlib/console-process/src/Command/BackgroundCommand.php on line 27

[chrisminett]

Fixed in #20