ci: update JDK from 11 to 17 in CI workflow

[devin-ai-integration]

Summary

Updates the GitHub Actions CI pipeline to use JDK 17 (Zulu distribution) instead of JDK 11. Only the .github/workflows/gradle.yml file is changed — the step name and java-version value are bumped from 11 to 17.

Review & Testing Checklist for Human

• Verify CI passes with JDK 17 — the build and tests must complete without compilation or runtime errors introduced by the JDK upgrade
• Confirm the project's sourceCompatibility/targetCompatibility in build.gradle are compatible with Java 17 (no mismatch that would cause silent issues)

Notes

• Requested by: @shayanshafii
• Link to Devin run

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[devin-ai-integration]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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

View in Devin Review to see 2 additional findings.