Leapp fails with `Status code: 404 for https://cdn.redhat.com/content/eus/rhel8/8.9/x86_64/baseos/os/repodata/repomd.xml`

Issue

leapp upgrade is failing to complete with a 404 trying to access an EUS repository.

Message: DNF execution failed with non zero exit code.
Summary:
    Stderr: Failed to create directory /var/lib/leapp/el8userspace//sys/fs/selinux: Read-only file system
            Failed to create directory /var/lib/leapp/el8userspace//sys/fs/selinux: Read-only file system
            Errors during downloading metadata for repository 'rhel-8-for-x86_64-baseos-eus-rpms':
              - Status code: 404 for https://cdn.redhat.com/content/eus/rhel8/8.9/x86_64/baseos/os/repodata/repomd.xml (IP: 23.60.144.251)
            Error: Failed to download metadata for repo 'rhel-8-for-x86_64-baseos-eus-rpms': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried