this package seems to have new commits in its VCS but has
not yet updated debian/changelog. You should consider updating
the Debian changelog and uploading this new version into the archive.
Here are the relevant commit logs:
Author: Alexander Kurtz <email@example.com>
Date: Thu Oct 24 17:30:32 2019 +0200
debian/gdm3.postinst: Remove obsolete cleanup code now that buster has been released.