build(deps-dev): bump friendsofphp/php-cs-fixer from 2.18.3 to 2.18.4

Bumps [friendsofphp/php-cs-fixer](https://github.com/FriendsOfPHP/PHP-CS-Fixer) from 2.18.3 to 2.18.4.
- [Release notes](https://github.com/FriendsOfPHP/PHP-CS-Fixer/releases)
- [Changelog](https://github.com/FriendsOfPHP/PHP-CS-Fixer/blob/2.18/CHANGELOG.md)
- [Commits](PHP-CS-Fixer/PHP-CS-Fixer@v2.18.3...v2.18.4)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]