CI failing - HTTP request 404

What's the status of this project? I noticed there hasn't been a commit for a long time, but the scheduled github actions are still running but some of them have been failing for quite some time. They try to request a tarball from a URL that doesn't exist:

https://partner-images.canonical.com/core/hirsute/ubuntu-hirsute-core-cloudimg-amd64-root.tar.gz