View file vendor/cakephp/utility/String.php

<?php
// @deprecated 3.5.0 Backward compatibility with 2.x series
if (PHP_VERSION_ID < 70000) {
    class_alias('Cake\Utility\Text', 'Cake\Utility\String');
    deprecationWarning('Use Cake\Utility\Text instead of Cake\Utility\String.');
}