build(deps): update dependency org.codehaus.mojo:exec-maven-plugin to v3.4.0 (#1698)

* build(deps): update dependency org.codehaus.mojo:exec-maven-plugin to v3.3.0

* 🦉 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>
Co-authored-by: Mridula <[email protected]>

Author: 3 people