bump year

Author: vladak

opengrok-indexer/src/main/java/org/opengrok/indexer/framework/PluginFramework.java

@@ -18,7 +18,7 @@
  */
 
 /*
- * Copyright (c) 2019, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2019, 2024, Oracle and/or its affiliates. All rights reserved.
  */
 package org.opengrok.indexer.framework;