Migrate to Java 21

[HindujaB]

Purpose

$subject

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility

[codecov]

Codecov Report

Attention: Patch coverage is 68.96552% with 9 lines in your changes missing coverage. Please review.

Project coverage is 86.76%. Comparing base (3c5e693) to head (b59f430).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
...n/java/io/ballerina/stdlib/websub/ModuleUtils.java	64.70%	5 Missing and 1 partial ⚠️
...erina/stdlib/websub/NativeHttpToWebsubAdaptor.java	75.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #668      +/-   ##
============================================
- Coverage     86.78%   86.76%   -0.02%     
- Complexity       38       39       +1     
============================================
  Files            14       13       -1     
  Lines           696      695       -1     
  Branches        358      189     -169     
============================================
- Hits            604      603       -1     
  Misses           87       87              
  Partials          5        5              

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[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud