Fix PHP 8.1 compat

Author: smnandre

src/Icons/src/Iconify.php

@@ -30,7 +30,7 @@ final class Iconify
     // URL must be 500 chars max (iconify limit)
     // -39 chars: https://api.iconify.design/XXX.json?icons=
     // -safe margin
-    private const int MAX_ICONS_QUERY_LENGTH = 400;
+    private const MAX_ICONS_QUERY_LENGTH = 400;
 
     private HttpClientInterface $http;
     private \ArrayObject $sets;