Update copyright years

Author: oschwald

README.md

@@ -560,6 +560,6 @@ The GeoIP2 Java API uses [Semantic Versioning](https://semver.org/).
 
 ## Copyright and License ##
 
-This software is Copyright (c) 2013-2023 by MaxMind, Inc.
+This software is Copyright (c) 2013-2025 by MaxMind, Inc.
 
 This is free software, licensed under the Apache License, Version 2.0.