Migrate to Java 21

[warunalakshitha]

Purpose

$Subject

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility
• No commons package changes (if there are any, please update the GraphQL version in GraphQL tools and Ballerina dev tools)
• No compiler package changes (if there are any, please update the GraphQL version in Ballerina dev tools)

[sonarqubecloud]

Quality Gate failed

Failed conditions
3.7% Duplication on New Code (required ≤ 3%)
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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[codecov]

Codecov Report

Attention: Patch coverage is 77.20588% with 31 lines in your changes missing coverage. Please review.

Project coverage is 85.00%. Comparing base (ef32797) to head (6817a44).
Report is 75 commits behind head on master.

Files with missing lines	Patch %	Lines
...allerina/stdlib/graphql/runtime/engine/Engine.java	72.22%	15 Missing and 5 partials ⚠️
...rina/stdlib/graphql/runtime/engine/DataLoader.java	73.33%	2 Missing and 2 partials ⚠️
...a/stdlib/graphql/runtime/client/QueryExecutor.java	82.35%	2 Missing and 1 partial ⚠️
...stdlib/graphql/runtime/engine/ArgumentHandler.java	88.88%	2 Missing ⚠️
...rina/stdlib/graphql/runtime/utils/ModuleUtils.java	33.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2100      +/-   ##
============================================
+ Coverage     84.91%   85.00%   +0.08%     
  Complexity      818      818              
============================================
  Files           127      127              
  Lines          9707     9722      +15     
  Branches       3822     2040    -1782     
============================================
+ Hits           8243     8264      +21     
+ Misses         1112     1109       -3     
+ Partials        352      349       -3     

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