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 0% with 45 lines in your changes missing coverage. Please review.

Project coverage is 76.87%. Comparing base (71f3257) to head (f1c62b8).
Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
.../ballerina/stdlib/mime/util/EntityBodyHandler.java	0.00%	45 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #546      +/-   ##
============================================
+ Coverage     76.85%   76.87%   +0.02%     
  Complexity        9        9              
============================================
  Files            21       21              
  Lines          1214     1211       -3     
  Branches        301      184     -117     
============================================
- Hits            933      931       -2     
+ Misses          199      198       -1     
  Partials         82       82              

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[TharmiganK]

LGTM

[sonarcloud]

Quality Gate passed

Issues
0 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