[ticket/10824] Move declare strict_types and adjust version

PHPBB3-10824

phpBB/phpbb/json/sanitizer.php

@@ -1,5 +1,4 @@
 <?php
-declare(strict_types=1);
 /**
  *
  * This file is part of the phpBB Forum Software package.
@@ -12,6 +11,8 @@ declare(strict_types=1);
  *
  */
 
+declare(strict_types=1);
+
 namespace phpbb\json;
 
 use phpbb\request\type_cast_helper;