Multiple versions of VS Code on Apple Mac
Here is the solution (taken from Stack Overflow Several versions of VSCode after update):

Locate the other versions
You can just run each of them, right-click on the Dock icon of the running version and select Options → Show in Finder.
My versions were located here at
~/Library/Application Support/com.microsoft.VSCode.ShipIt/update.OhD5XFk

Delete it
Just delete the whole directory update.OhD5XFk