deps: update dependency gcp-releasetool to v1.10.3 (#593)

* deps: update dependency gcp-releasetool to v1.10.3 * 🦉 Updates from OwlBot post-processor See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md --------- Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: renovate-bot