Add support for PHP ≥ 8.0

[waclawjacek]

When setting the PHP version for the ServerPilot app to 8.0 or higher, the following error message appears:

Fatal error: Uncaught Error: Unknown named parameter $class in /srv/users/jurassic-ninja-dev/apps/jurassic-ninja-dev/public/wp-content/plugins/jurassic.ninja/lib/RationalOptionPages.php:283 Stack trace: #0 /srv/users/jurassic-ninja-dev/apps/jurassic-ninja-dev/public/wp-includes/class-wp-hook.php(324): RationalOptionPages->admin_init('') #1 /srv/users/jurassic-ninja-dev/apps/jurassic-ninja-dev/public/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #2 /srv/users/jurassic-ninja-dev/apps/jurassic-ninja-dev/public/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #3 /srv/users/jurassic-ninja-dev/apps/jurassic-ninja-dev/public/wp-admin/admin.php(175): do_action('admin_init') #4 /srv/users/jurassic-ninja-dev/apps/jurassic-ninja-dev/public/wp-admin/plugin-install.php(16): require_once('/srv/users/jura...') #5 {main} thrown in /srv/users/jurassic-ninja-dev/apps/jurassic-ninja-dev/public/wp-content/plugins/jurassic.ninja/lib/RationalOptionPages.php on line 283

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Using PHP 7.4 works well.