Migrate to Java 21

[ravinperera00]

Purpose

Examples

Checklist

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

[ravinperera00]

Some failing tests were disabled. An issue was created to track that (ballerina-platform/ballerina-library#7445)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.70%. Comparing base (49c76e8) to head (d330141).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1010      +/-   ##
============================================
- Coverage     80.02%   77.70%   -2.32%     
+ Complexity      257      248       -9     
============================================
  Files            23       23              
  Lines           951      951              
  Branches        215      205      -10     
============================================
- Hits            761      739      -22     
- Misses           92      116      +24     
+ Partials         98       96       -2     

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[daneshk]

@ravinperera00 We made a fix for the test failures in SQL module[1]. Please update the SQL version to 1.15.0-20241209-080300-e02c018 and enable testcases again

1. Fix the out parameter test failuer in Postgres DB module-ballerina-sql#760