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

Testing done

Confirmed that tests pass.

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

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 11 lines in your changes missing coverage. Please review.

Project coverage is 71.99%. Comparing base (803edab) to head (a1b734c).
Report is 35 commits behind head on master.

Files with missing lines	Patch %	Lines
...ins/plugins/checks/github/GitHubChecksDetails.java	31.25%	9 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #427      +/-   ##
============================================
+ Coverage     71.80%   71.99%   +0.18%     
- Complexity      162      163       +1     
============================================
  Files            16       16              
  Lines           532      532              
  Branches         51       51              
============================================
+ Hits            382      383       +1     
+ Misses          124      123       -1     
  Partials         26       26              

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[timja]

Thanks!