widget-factory: Add Keyboard Shortcuts menu item

Closes: GNOME/gtk#916
4 jobs for bye-app-menu-gtk4 in 26 minutes and 3 seconds (queued for 10 minutes and 18 seconds)
Status Job ID Name Coverage
  Build
passed #114403
fedora-x86_64

00:05:57

passed #114404
win32
msys2-mingw32

00:13:20

 
  Flatpak
passed #114405
flatpak:demo

00:04:59

passed #114406
flatpak:widget-factory

00:04:57