Last name is required on registration, and I think it shouldn't

[mariavilaro]

When using the registration component, the last_name field is required:

Validator::make($input, [
    'first_name' => ['required', 'string', 'max:255'],
    'last_name' => ['required', 'string', 'max:255'],
    ...

But it's not required in the user model rules:

public $rules = [
    'first_name' => ['required', 'string', 'max:255'],
    'email' => ['required', 'between:3,255', 'email', 'unique:users,email,NULL,id,is_guest,false'],
    'username' => ['required', 'between:2,255', 'unique:users,username,NULL,id,is_guest,false'],
    'password' => ['required:create', 'string', 'confirmed'],
    'avatar' => ['nullable', 'image', 'max:4000'],
];

It's not needed neither in the backend user edition, and in the Readme file it says that the last name is not required. So I think that the registration component shouldn't require it.