Fix types for ConfirmableTrait::confirmToProceed

[rolfvandekrol]

This PR adds a default value to the TReturn template type for ConfirmableTrait::confirmToProceed. Without this, the following code gives a PHPStan error (on level 6 and higher).

<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;
use Illuminate\Console\ConfirmableTrait;

class MyCommand extends Command
{
    use ConfirmableTrait;

    protected $signature = 'my-command';

    public function handle(): void
    {
        if ($this->confirmToProceed()) {
            // Do something destructive
        }
    }
}

Without any parameters PHPStan cannot determine the value of TReturn. In that case bool seems like a reasonable default. This is a problem since Laravel 12.50.0 because of the changes in #58565

[rolfvandekrol]

The MariaDB tests have failed, because Github thinks they take too long. I can't find a button to retry (probably don't have the permissions for that), but I can't imagine this change breaks the MariaDB tests.