Use jenkins.baseline to reduce bom update mistakes

[strangelookingnerd]

Use jenkins.baseline in pom.xml

This change is proposed by the plugin archetype and makes maintenance of jenkins.version and bom a little easier.

Testing done

None. Rely on ci.jenkins.io to test it.

Submitter checklist

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• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
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