VL-4836 - Prep work for release

pom.xml
-------
  o Bump sadis.api version to the latest release 5.9.0

miscellaneous
-------------
  o Update copyright notice to the latest date and syntax.

Change-Id: Ie9a35ae703da9b9796afb8ea857738991d4d07d1
diff --git a/pom.xml b/pom.xml
index b851fe2..6059c94 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-  ~ Copyright 2015-present Open Networking Foundation
+  ~ Copyright 2015-2023 Open Networking Foundation (ONF) and the ONF Contributors
   ~
   ~ Licensed under the Apache License, Version 2.0 (the "License");
   ~ you may not use this file except in compliance with the License.