CleanRayCommand should support versions of Laravel older than Laravel 10

[joshlewis]

CleanRayCommand relies on Illuminate\Support\Facades\Process, which was introduced with Laravel 10.

I think it would be really great if the code could support running the ray:clean command for people who are using a version of Laravel older than Laravel 10.

[freekmurze]

If it's very simple and tested, I'd consider merging it in