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If you created a ICMP Rule, the port is nullable.
This change fixes:
_TypeError: LKDev\HetznerCloud\Models\Firewalls\FirewallRule::_construct(): Argument #5 ($port) must be of type string, null given, called in /var/www/html/vendor/lkdevelopment/hetzner-cloud-php-sdk/src/Models/Firewalls/Firewall.php on line 112 and defined in /var/www/html/vendor/lkdevelopment/hetzner-cloud-php-sdk/src/Models/Firewalls/FirewallRule.php:48