Showcase Version Mismatch: librarian.yaml and pom.xml out of sync

[github-actions]

The Showcase version in java-showcase/gapic-showcase/pom.xml and the commit in librarian.yaml do not match. Please update them to match. See logs: https://github.com/googleapis/google-cloud-java/actions/runs/28403686969

[lqiu96]

Should be resolved by #13594