pom.xml: bump plugin-parent and bom

[jimklimov]

After recent updates and restart of the Jenkins controller, our jobs began failing with post-processing:

Error when executing always post condition:
java.lang.ClassNotFoundException: org.eclipse.collections.impl.factory.Sets
	at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445)
	at jenkins.util.URLClassLoader2.findClass(URLClassLoader2.java:35)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:587)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
	at io.jenkins.plugins.reporter.steps.PublishReportStep$Descriptor.getRequiredContext(PublishReportStep.java:117)
...
Also:   org.jenkinsci.plugins.workflow.actions.ErrorAction$ErrorId: e97f9fd3-2730-4261-8c7f-43fe43486b35
Caused: java.lang.NoClassDefFoundError: org/eclipse/collections/impl/factory/Sets
	at io.jenkins.plugins.reporter.steps.PublishReportStep$Descriptor.getRequiredContext(PublishReportStep.java:117)
...

After some discussion on Jenkins Gitter thread : https://matrix.to/#/!ouJVNKRtaWHFflDvBW:gitter.im/$yuB2vuyrvhG7R1WfNz2GMvvWQH4Hr7dO7SIK6T4pQx8?via=gitter.im&via=matrix.org&via=minds.com I tried to use a custom build of the plugin to ensure that it relies on newer jenkins-bom (maybe its updates in core deprecated something the plugin binary relied on?) and the problem went away ;)