POM syntax fix.
Some problems were encountered while building the effective model for org.jenkins-ci.main:remoting:jar:2.29-SNAPSHOT
'build.plugins.plugin.(groupId:artifactId)' must be unique but found duplicate declaration of plugin org.apache.maven.plugins:maven-dependency-plugin @ line 248, column 15
[JENKINS-18403] More reliable way of enforcing maximum bytecode version on a remoting channel.