Update pom.xml

solve problem:
Caused by: org.apache.maven.project.ProjectBuildingException: Cannot find parent: org.jenkins-ci.plugins:plugin for project: com.tekante.jenkins:dynamic-parameter:hpi:1.0 for project com.tekante.jenkins:dynamic-parameter:hpi:1.0

Caused by: org.apache.maven.project.InvalidProjectModelException: Not a v4.0.0 POM. for project org.jenkins-ci.plugins:plugin at /root/.m2/repository/org/jenkins-ci/plugins/plugin/1.449/plugin-1.449.pom