Do not run CI against EOL JDK versions

Author: yrodiere

Jenkinsfile

@@ -35,8 +35,6 @@ stage('Configure') {
 		// We want to enable preview features when testing newer builds of OpenJDK:
 		// even if we don't use these features, just enabling them can cause side effects
 		// and it's useful to test that.
-		new BuildEnvironment( testJdkVersion: '23', testJdkLauncherArgs: '--enable-preview' ),
-		new BuildEnvironment( testJdkVersion: '24', testJdkLauncherArgs: '--enable-preview' ),
 		new BuildEnvironment( testJdkVersion: '25', testJdkLauncherArgs: '--enable-preview' )
 		// The following JDKs aren't supported by Hibernate ORM out-of-the box yet:
 		// they require the use of -Dnet.bytebuddy.experimental=true.