bump copyright year

Author: vladak

opengrok-web/src/main/webapp/xref.jspf

@@ -16,7 +16,7 @@ information: Portions Copyright [yyyy] [name of copyright owner]
 
 CDDL HEADER END
 
-Copyright (c) 2015, 2023, Oracle and/or its affiliates. All rights reserved.
+Copyright (c) 2015, 2025, Oracle and/or its affiliates. All rights reserved.
 Portions Copyright 2011 Jens Elkner.
 Portions Copyright (c) 2017-2020, Chris Fraire <[email protected]>.
 --%>