refactor: remove unused property

Author: kenjis

system/Encryption/Handlers/BaseHandler.php

@@ -13,20 +13,12 @@
 
 use CodeIgniter\Encryption\EncrypterInterface;
 use Config\Encryption;
-use Psr\Log\LoggerInterface;
 
 /**
  * Base class for encryption handling
  */
 abstract class BaseHandler implements EncrypterInterface
 {
-    /**
-     * Logger instance to record error messages and warnings.
-     *
-     * @var LoggerInterface
-     */
-    protected $logger;
-
     /**
      * Constructor
      */