Add Arrayable docblock for static analysis

`$instance->render($component, $props);` can deal with arrays and arrayable objects, though the docblock on the `inertia` helper function only specifies `array` as a possible type. This causes static analysis tools to complain when you pass in an arrayable.

Author: brendt

helpers.php

@@ -5,7 +5,7 @@
      * Inertia helper.
      *
      * @param null|string $component
-     * @param array       $props
+     * @param array|\Illuminate\Contracts\Support\Arrayable $props
      *
      * @return \Inertia\ResponseFactory|\Inertia\Response
      */