updated maven pom to use repo.jenkins-ci.org repository
updated maven pom to use repo.jenkins-ci.org repository

jenkinsci/repo-plugin,solganik/repo-plugin,solganik/repo-plugin,mikaukora/repo-plugin,maksonlee/repo-plugin,maksonlee/repo-plugin,mikaukora/repo-plugin,Typz/repo-plugin,jenkinsci/repo-plugin,Typz/repo-plugin