Upgrade to Laravel 9 (#4413)

Co-authored-by: DaneEveritt <dane@daneeveritt.com>

app/Models/DatabaseHost.php

@@ -2,6 +2,9 @@
 
 namespace Pterodactyl\Models;
 
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
 /**
  * @property int $id
  * @property string $name
@@ -22,29 +25,20 @@ class DatabaseHost extends Model
      */
     public const RESOURCE_NAME = 'database_host';
 
-    /**
-     * @var bool
-     */
-    protected $immutableDates = true;
+    protected bool $immutableDates = true;
 
     /**
      * The table associated with the model.
-     *
-     * @var string
      */
     protected $table = 'database_hosts';
 
     /**
      * The attributes excluded from the model's JSON form.
-     *
-     * @var array
      */
     protected $hidden = ['password'];
 
     /**
      * Fields that are mass assignable.
-     *
-     * @var array
      */
     protected $fillable = [
         'name', 'host', 'port', 'username', 'password', 'max_databases', 'node_id',
@@ -52,8 +46,6 @@ class DatabaseHost extends Model
 
     /**
      * Cast values to correct type.
-     *
-     * @var array
      */
     protected $casts = [
         'id' => 'integer',
@@ -63,10 +55,8 @@ class DatabaseHost extends Model
 
     /**
      * Validation rules to assign to this model.
-     *
-     * @var array
      */
-    public static $validationRules = [
+    public static array $validationRules = [
         'name' => 'required|string|max:191',
         'host' => 'required|string',
         'port' => 'required|numeric|between:1,65535',
@@ -77,20 +67,16 @@ class DatabaseHost extends Model
 
     /**
      * Gets the node associated with a database host.
-     *
-     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
      */
-    public function node()
+    public function node(): BelongsTo
     {
         return $this->belongsTo(Node::class);
     }
 
     /**
      * Gets the databases associated with this host.
-     *
-     * @return \Illuminate\Database\Eloquent\Relations\HasMany
      */
-    public function databases()
+    public function databases(): HasMany
     {
         return $this->hasMany(Database::class);
     }