Backport !1103 “gs-update-monitor: Recognize security updates” to gnome-41
requested to merge pwithnall/gnome-software:backport-1103-update-monitor-security-gnome-41 into gnome-41
There was used a metadata item "is-security", but it's not used anywhere in the code. Rather than that check for the update urgency of the app and whether it's already downloaded.
Trivial backport of !1103 (merged) to gnome-41.