[Backport 2.x] Update GA worklows to use JDK 21.0.2

[owaiskazi19]

Description

Backport of #436

Issues Resolved

List any issues this PR will resolve, e.g. Closes [...].

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1b7b84d) 71.88% compared to head (25b79e6) 71.88%.

Additional details and impacted files

@@            Coverage Diff            @@
##                2.x     #439   +/-   ##
=========================================
  Coverage     71.88%   71.88%           
  Complexity      620      620           
=========================================
  Files            78       78           
  Lines          3126     3126           
  Branches        236      236           
=========================================
  Hits           2247     2247           
  Misses          772      772           
  Partials        107      107           

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[dbwiddis]

Approving but would like all tests to pass before merging.

[reta]

Thanks @owaiskazi19 and @dbwiddis !