Extend license header copyright years to 2023.

See #1870

Author: mp911de

pom.xml

@@ -51,7 +51,7 @@
 			<name>Apache License, Version 2.0</name>
 			<url>https://www.apache.org/licenses/LICENSE-2.0</url>
 			<comments>
-			Copyright 2010 the original author or authors.
+			Copyright 2010-2023 the original author or authors.
 
 			Licensed under the Apache License, Version 2.0 (the "License");
 			you may not use this file except in compliance with the License.