--- a/wp/wp-admin/network/upgrade.php	Tue Dec 15 15:52:01 2020 +0100
+++ b/wp/wp-admin/network/upgrade.php	Wed Sep 21 18:19:35 2022 +0200
@@ -45,7 +45,7 @@
 
 switch ( $action ) {
 	case 'upgrade':
-		$n = ( isset( $_GET['n'] ) ) ? intval( $_GET['n'] ) : 0;
+		$n = ( isset( $_GET['n'] ) ) ? (int) $_GET['n'] : 0;
 
 		if ( $n < 5 ) {
 			/**