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: Simon McVittie <firstname.lastname@example.org>
Date: Sat Dec 19 12:38:09 2020 +0000
d/gbp.conf: Rename development branch to debian/latest