Merge pull request #9013 from kenjis/refactor-Filters

[4.6] refactor: add `: void`

system/Filters/Filters.php

@@ -617,7 +617,7 @@ private function getCleanName(string $filter): array
         [$alias, $arguments] = explode(':', $filter);
 
         $arguments = explode(',', $arguments);
-        array_walk($arguments, static function (&$item) {
+        array_walk($arguments, static function (&$item): void {
             $item = trim($item);
         });