Switch to the recommended `heroku/builder:22` image. https://github.com/heroku/cnb-builder-images#available-images ## Release notes As the `heroku/builder:20` image used by the Auto Build component of Auto DevOps was deprecated upstream, we are moving to the `heroku/builder:22` image. The new images are based on `ubuntu:22.04` instead of `ubuntu:20.04` and the respective packages. Otherwise, they support the same version `0.18.x` cloud native buildpack lifecycle APIs. This breaking change arrives outside a GitLab major release as we need to accommodate a breaking change upstream and the upgrade is unlikely to break app developers' pipelines. If needed, users can manually configure to user the `heroku/builder:20` and skip the errors to revert the changes.