Update copyright year in `NOTICE`
diff --git a/NOTICE b/NOTICE
index 468a2f5..eaab50a 100644
--- a/NOTICE
+++ b/NOTICE
@@ -1,5 +1,5 @@
    Apache log4net
-   Copyright 2004-2022 The Apache Software Foundation
+   Copyright 2004-2024 The Apache Software Foundation
 
    This product includes software developed at
    The Apache Software Foundation (https://www.apache.org/).