Roster doesn't detect PHPUnit

[tmannherz]

Laravel Roster Version

v0.2.5

Laravel Version

12.21.0

PHP Version

8.4.8

Database Driver & Version

MySQL 8.0.42 via Docker

Description

Roster doesn't correctly list PHPUnit as in the roster when it is installed.

use Laravel\Roster\Roster;
use Laravel\Roster\Enums\Packages;

$roster = Roster::scan(base_path());
$roster->uses(Packages::PHPUNIT); // returns `false`

Seems like phpunit/phpunit is missing from the Composer map: https://github.com/laravel/roster/blob/main/src/Scanners/Composer.php#L19-L54

Steps To Reproduce

1. Create a new Laravel project.
2. Install the latest version of PHPUnit (v12) and Roster
3. Run script above

Unrelated, but in the README.md under the Query the roster section, use Laravel\Roster\Packages; should be use Laravel\Roster\Enums\Packages;