Make package compatible with Laravel 12, Nova 5 and PHP 8.4

[BernhardK91]

This PR makes the package compatible to

• Laravel 12
• Nova 5
• PHP 8.4

The already existing PR by @laravel-shift was branched from an older state and does not include Nova 5.

This branch can be used in composer by adding:

"repositories": [
        {
            "type": "vcs",
            "url": "https://github.com/BernhardK91/nova-json.git"
        }
    ],

And then the version constrained: dev-laravel12-nova5

"require": {
    "naoray/nova-json": "dev-laravel12-nova5",
}