Require Jenkins 2.479.1 and Jakarta EE 9

[strangelookingnerd]

Require Jenkins 2.479.1 and Jakarta EE 9

Jenkins 2.479.1 provides Jakarta EE 9, Eclipse Jetty 12, Spring Security 6, and Java 17.

• Update plugin pom and baseline
• Remove deprecations
• Use Java 17 language features
• Minor cleanup

Testing done

mvn clean verify

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[jglick]

@strangelookingnerd when you force-push to a nontrivial PR, it resets GH’s counter of the last-reviewed commit and forces any reviewer to start from scratch. Better IMO to just push a simple follow-on commit. The maintainer can choose to either merge or squash.

[jglick]

(remember you can accept suggested edits in batch rather than one commit per)

[jglick]

Thanks!