[maven-release-plugin] rollback the release of jenkins-multijob-plugin-1.21
[maven-release-plugin] rollback the release of jenkins-multijob-plugin-1.21

cohencil/tikal-multijob-plugin,jenkinsci/tikal-multijob-plugin,jenkinsci/tikal-multijob-plugin,sshelomentsev/tikal-multijob-plugin,cohencil/tikal-multijob-plugin,sshelomentsev/tikal-multijob-plugin