chore: update Copyright year in README

Author: phanak-sap

README.md

@@ -91,6 +91,6 @@ Your username is `yourname` and you're submitting a basic bugfix or feature.
 
 ## License
 
-Copyright (c) 2019 SAP SE or an SAP affiliate company. All rights reserved.
+Copyright (c) 2023 SAP SE or an SAP affiliate company. All rights reserved.
 This file is licensed under the Apache Software License, v. 2 except as noted
 otherwise in [the LICENSE file](LICENSE)