Not that I can see in my demo instance.
Out of the box there is a notification called KM: Approve article for publishing that triggers based on an approval record being inserted/updated where it's State changes to Requested and where the Source Table is one of the knowledge article tables (see below screen shot) this would include the Retirement approvals if it wasn't for it's Advanced Condition (highlighted) that will only fire the notification if the Knowledge Article state = draft and the system property glide.knowman.enable_approval_notification = true.
So the long and short is it won't fire for approvals for Knowledge Article Retirement.
