Update Java version from 11 to 17 in build and CI configuration

[devin-ai-integration]

Summary

Updates Java version from 11 to 17 in two places:

• build.gradle: sourceCompatibility and targetCompatibility changed from '11' to '17'
• .github/workflows/gradle.yml: CI setup-java step updated from JDK 11 to JDK 17 (required for CI to compile against Java 17 source/target)

No dependency or code changes are included; Spring Boot 2.6.3 and the existing dependency set already support Java 17.

Updates since last revision

Added the CI workflow change (.github/workflows/gradle.yml) — the initial build.gradle-only change caused CI to fail with error: invalid source release: 17 because the runner was still provisioning JDK 11. App was verified locally with ./gradlew bootRun on Java 17 and all CI checks now pass.

Review & Testing Checklist for Human

• Confirm no other CI workflows or tooling (e.g. Dockerfiles, scripts) still reference Java 11 and would break
• Run ./gradlew clean test locally with a Java 17 JDK to verify no runtime regressions beyond what CI covers

Notes

• Devin run
• Requested by: @VedantKh

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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