Update NOTICE to 2023
diff --git a/NOTICE.txt b/NOTICE.txt
index dcfd29d..27ade1a 100644
--- a/NOTICE.txt
+++ b/NOTICE.txt
@@ -1,5 +1,5 @@
 Apache Commons Proxy
-Copyright 2005-2016 The Apache Software Foundation
+Copyright 2005-2023 The Apache Software Foundation
 
 This product includes software developed by
 The Apache Software Foundation (http://www.apache.org/).