[java-11-app] fix(java): Java upgrade: 11 → Java 21#7

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saicharansm wants to merge 1 commit into

atx-result-staging-20260709_022747_25ebc8d9

Commits on Jul 9, 2026

Step 1: Upgrade Java from 11 to 21. Updated pom.xml (java.version=21, maven-compiler-plugin 3.13.0, maven-surefire-plugin 3.2.5, maven-javadoc-plugin 3.6.3, JUnit 5.10.2, AssertJ 3.27.7), gradle.pr…
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