Stop testing on EOLed JDKs

Author: marko-bekhta

Jenkinsfile

@@ -155,13 +155,7 @@ 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 JdkBuildEnvironment(version: '20', testCompilerTool: 'OpenJDK 20 Latest',
-							testLauncherArgs: '--enable-preview',
-							condition: TestCondition.AFTER_MERGE),
 					new JdkBuildEnvironment(version: '21', testCompilerTool: 'OpenJDK 21 Latest',
-							testLauncherArgs: '--enable-preview',
-							condition: TestCondition.AFTER_MERGE),
-					new JdkBuildEnvironment(version: '22', testCompilerTool: 'OpenJDK 22 Latest',
 							testLauncherArgs: '--enable-preview',
 							condition: TestCondition.AFTER_MERGE)
 					// IMPORTANT: Make sure to update the documentation for any newly supported Java versions