JDK update in workflows to version 21

[sumukhswamy]

Description

[Describe what this change achieves]

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.47%. Comparing base (a8ca3b6) to head (d19aecb).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #352      +/-   ##
==========================================
- Coverage   59.13%   57.47%   -1.66%     
==========================================
  Files          39       40       +1     
  Lines        1867     1907      +40     
  Branches      332      345      +13     
==========================================
- Hits         1104     1096       -8     
- Misses        647      689      +42     
- Partials      116      122       +6     

Flag	Coverage Δ
dashboards-query-workbench	57.47% <ø> (-1.66%)	⬇️

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[ps48]

@sumukhswamy Does this need a backport?

[sumukhswamy]

no backport needed 21 not needed for 2.x