[12.x] Enum as queue overlap key

[finagin]

This PR allows using Enum as a key for middleware WithoutOverlapping

Note

The changes are fully backward compatible and do not disrupt existing applications.

namespace App\Enums;

enum Category
{
    case suit;
    case dress;
}

namespace App\Jobs;

use App\Enums\Category;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Queue\Queueable;
use Illuminate\Queue\Middleware\WithoutOverlapping;

class UpdateCategory implements ShouldQueue
{
    use Queueable;

    public function __construct(
        protected Category $category,
    ) {}

    public function middleware(): array
    {
        return [new WithoutOverlapping($this->category)];
    }

    public function __invoke(): void
    {
        // Some code
    }
}