Upgrade composer.json to allow PHP 8.4

[RalfEggert]

Add PHP 8.4 version for #42

[froschdesign]

@RalfEggert
The problem here is Psalm.

Please extend the file .laminas-ci.json:

{
    "ignore_php_platform_requirements": {
        "8.4": true
    },
    "backwardCompatibilityCheck": true
}

[RalfEggert]

@froschdesign

Ok, is it better?

[nicklog]

I would be very grateful if something could be done here :)