Upgrade to plugin-pom

In order to use the new POM:

Change the parent POM of your plugin:
<parent>
<groupId>org.jenkins-ci.plugins</groupId>
<artifactId>plugin</artifactId>
<version>2.3</version>
</parent>
Override the needed properties, e.g.:
<properties>
<jenkins.version>1.424</jenkins.version>
</properties>