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: Laurent Bigonville <firstname.lastname@example.org>
Date: Wed Dec 16 14:11:55 2020 +0100
librsvg2-dev.in: Bump librsvg2-dev Build-dependency to 2.45.5
gnome-games needs Rsvg.Length that has been introduced in that version