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: Ludovic Brenta <email@example.com>
Date: Sun Dec 13 18:30:16 2020 +0100
Reupload to unstable for gnat-10 transition, add myself to Uploaders