Update SerializesCastableAttributes.php (#52841)

Author: cosmastech

src/Illuminate/Contracts/Database/Eloquent/SerializesCastableAttributes.php

@@ -12,7 +12,7 @@ interface SerializesCastableAttributes
      * @param  \Illuminate\Database\Eloquent\Model  $model
      * @param  string  $key
      * @param  mixed  $value
-     * @param  array  $attributes
+     * @param  array<string, mixed>  $attributes
      * @return mixed
      */
     public function serialize(Model $model, string $key, mixed $value, array $attributes);