Remove GarageBand update notification Big Sur
So I have an iMac running 10.15.7 (late 2012) which I don't believe I can update effectively to Big Sur and yet I keep getting App Store notifications to update GarageBand. When I try, I'm told I need to update to Big Sur before I can update. So the whole sorry circle plays out again a few days later.
How, without deleting GarageBand, can I disable this update notification?
iMac 27″, macOS 10.15