Bump JDK 21 from ea to GA

[m1ngyuan]

Changes proposed in this pull request:

• JDK 21 is go GA now

[codecov-commenter]

Codecov Report

Merging #2278 (f72ae7a) into master (3d4f604) will increase coverage by 0.02%.
Report is 1 commits behind head on master.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2278      +/-   ##
============================================
+ Coverage     85.11%   85.14%   +0.02%     
+ Complexity     1239     1238       -1     
============================================
  Files           215      215              
  Lines          3984     3984              
  Branches        454      454              
============================================
+ Hits           3391     3392       +1     
  Misses          386      386              
+ Partials        207      206       -1     

see 1 file with indirect coverage changes

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[linghengqian]

• CI is fixed in the master branch, please merge the master branch.

[linghengqian]

• I tweaked some of the unit tests that affected Windows CI at Relax the conditions for unit tests involving awaitility to fix CI #2293 .

• LGTM!