java8 image not working with java11 compiled dependencies

example kogito-travel-agency/basic in master branch:

when running the example as described inside the Dockerfile.jvm, the following exception happens:

Caused by: java.lang.UnsupportedClassVersionError: io/quarkus/bootstrap/logging/InitialConfigurator has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0

Seems like the io.quarkus.bootstrap:quarkus-bootstrap-parent Java version was advanced from java 8 -> java 11 and now the fabric8/java-alpine-openjdk8-jre runtime is not fitting - replacing with java-alpine-openjdk11-jre works

the fabric8/java-alpine-openjdk8-jre is used in several examples - all of them should be upgraded to the java11 image