The PHP-CS-Fixer CI fix introduces breaking changes #520
Description
The CI environment for php-cs-fixer uses PHP 8.4, so some string-related code has been updated to be compatible with this version—for example, replacing rtrim(...) with mb_rtrim(...). Although the mb_rtrim function was introduced in PHP 8.4, our codebase remains fully compatible with PHP 8.1 and above.