[8.x] Make user policy command fix (Windows)

[zholzhas]

When trying to run php artisan make:policy UserPolicy --model=User on Windows, the created file will contain:

use App\Models\User;
use App\Models\User;

[derekmd]

Many Windows devs have Git configured to checkout code using Unix "\n" newlines:

git config --global core.autocrlf false
git config --global core.eol lf

So this change would break that behaviour. i.e., on Windows the code is now trying to match \r\n but the downloaded "laravel/framework" stub is formatted with \n.

A wider fix would be a switch to using preg_replace() to match any newline characters:

return preg_replace(
    vsprintf('/use %s;[\r\n]+use %s;/', [
        preg_quote($namespacedModel, '/'),
        preg_quote($namespacedModel, '/'),
    ]),
    "use {$namespacedModel};",
    $stub
);

[taylorotwell]

Feel free to resubmit with @derekmd's suggestion.