[java-11-app] fix(java): Java upgrade: 11 → Java 21#6

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saicharansm wants to merge 1 commit into

atx-result-staging-20260708_223257_9be8433d

Commits on Jul 8, 2026

Upgrade Java from 11 to 21: Updated java.version, sourceCompatibility, targetCompatibility to 21; upgraded maven-compiler-plugin to 3.13.0, maven-surefire-plugin to 3.2.5, maven-javadoc-plugin to 3…
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