Fix Warning

Author: zonky2

src/ContaoManager/Plugin.php

@@ -3,7 +3,7 @@
 /**
  * This file is part of menatwork/contao-multicolumnwizard-bundle.
  *
- * (c) 2012-2019 MEN AT WORK.
+ * (c) 2012-2024 MEN AT WORK.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
@@ -15,7 +15,7 @@
  * @author     Stefan Heimes <[email protected]>
  * @copyright  2011 Andreas Schempp
  * @copyright  2011 certo web & design GmbH
- * @copyright  2013-2019 MEN AT WORK
+ * @copyright  2013-2024 MEN AT WORK
  * @license    https://github.com/menatwork/contao-multicolumnwizard-bundle/blob/master/LICENSE LGPL-3.0-or-later
  * @filesource
  */
@@ -37,7 +37,7 @@ class Plugin implements BundlePluginInterface
     /**
      * {@inheritdoc}
      */
-    public function getBundles(ParserInterface $parser)
+    public function getBundles(ParserInterface $parser): array
     {
         return [
             BundleConfig::create(MultiColumnWizardBundle::class)