The legacy service s3pository has been retired
Change effective on 03 August 2022
s3pository.heroku.com was a proxying and mirroring service for Node.js, Maven, Grails, Clojure, and Play! artifacts. It has been retired and shutdown.
The only known consumers of this service are very old Heroku buildpack versions and/or forked versions of those old buildpacks. If issues are encountered during builds relating to s3pository.heroku.com, consider updating to the latest buildpack version or adjusting any dependencies to download assets direct from first party repositories like nodejs.org, repo1.maven.org, repository.jboss.org, repo.grails.org, clojars.org, or repo.typesafe.com.