Ensure classes follow PSR-4

Author: paulbalandan

utils/PhpCsFixer/CodeIgniter4.php

@@ -238,6 +238,7 @@ public function __construct()
             'phpdoc_var_without_name'             => true,
             'pow_to_exponentiation'               => true,
             'protected_to_private'                => true,
+            'psr_autoloading'                     => ['dir' => null],
             'set_type_to_cast'                    => true,
             'short_scalar_cast'                   => true,
             'standardize_increment'               => true,