Add support for Java 25

Add openjdk25.sh script to enable building Java 25 dependency artifacts from BellSoft Liberica JDK.

BellSoft Liberica already has multiple releases for version 25.0.1 listed here : https://api.bell-sw.com/v1/liberica/releases?version-feature=25

This would help unblock cloudfoundry/java-buildpack#1121.