Migrate to Java 21 and new Runtime APIs

[ravinperera00]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.2% Duplication on New Code

See analysis details on SonarQube Cloud

[warunalakshitha]

we need to keep @project.version. Need to fix in other places too

[ravinperera00]

I think this is from the auto-commit. I will replace in all the relevant places.

[ravinperera00]

Shall I send the changes directly to master instead of the java21 branch? @warunalakshitha

[warunalakshitha]

+1