Mark as end-of-life
    
    Dosbox rpm was retired from F35 in
    https://src.fedoraproject.org/rpms/dosbox/c/74f52b332b1c3ba390ccb12368d896a54cdcd5db?branch=rawhide
    
    The replacement for the package is dosbox-staging. If we want to keep
    providing a dosbox version as flatpak, we should make a flatpak of
    dosbox-staging (under a new name) and mark this one (dosbox) as
    "end-of-life-rebase: io.github.dosbox-staging" to ensure users are moved
    over to the new flatpak.