use java11

[codezninja]

Merge Checklist

• Have you linked this Pull Request to an Issue?
• Have you updated any relevant README files, to explain how this new feature works (with examples)?
• Have you added relevant test cases for your change?
• Do all tests and code style checks pass with ./gradlew check --info?
• Have you successfully run your change in a pipeline in a Jenkins instance?
• Have you updated the CHANGELOG?

Fixes #409

[kmanning]

Looks good. Can you update the CHANGELOG before you merge?

[codecov-commenter]

Codecov Report

Merging #410 (f2eaec7) into master (a14c20d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #410   +/-   ##
=======================================
  Coverage   82.31%   82.31%           
=======================================
  Files          53       53           
  Lines        1453     1453           
  Branches      307      307           
=======================================
  Hits         1196     1196           
  Misses        115      115           
  Partials      142      142           

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[kmanning]

Looks great, merge when you're ready