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: Helmut Grohne <firstname.lastname@example.org>
Date: Sun Feb 7 11:10:20 2021 +0100
Drop unused graphviz depdendency since HAVE_DOT=no