[8.x] Password Validator should inherit custom error message and attribute

[jochensengier]

A Form Request or Validator with a custom attribute and/or message for a password field are discarded in the Validator of the Password Rule and defaults are returned.

Example Form Request:

...

public function rules()
{
    return [
        'password' => [
            Password::min(8),
        ],
    ];
}

public function attributes()
{
    return [
        'password' => 'alternative attribute',
    ];
}

public function messages()
{
    return [
        'password.min' => 'Demo for Pull Request :attribute',
    ];
}

...

It should return 'Demo for Pull Request: alternative attribute' however, 'The password must be at least 8 characters.' is returned.

Unless I'm mistaken, this should be an easy fix without any breaking changes.

Looking forward to any feedback and suggestions regarding this pull request.

Thanks!