[8.x] Fixes restrictive type declaration in InteractsWithViews testing concern

[rbarden]

This PR removes the array type declaration on the InteractsWithViews concern used in testing. These methods should ultimately have the type declaration of Arrayable|array, but until the framework's minimum PHP version is increased to 8, the type declaration should be removed.

With this array type declaration, one must explicitly call ->toArray() on any Arrayable they are using, otherwise a TypeError is thrown: TypeError : Illuminate\Foundation\Testing\TestCase::view(): Argument #2 ($data) must be of type array, ...

public function test_view()
{
    $arrayable = new SomeArrayable();
    $this->view('post.form', $arrayable->toArray());
}

public function test_view()
{
    $arrayable = new SomeArrayable();
    $this->view('post.form', $arrayable);
}

[driesvints]

These are breaking changes to the method signature and thus best sent to master.