unable to build GNOME images with systemd

I'm unable to build gnome-mobile images with the systemd staging branch, because of some conflict with gnome-extensions-app:

ERROR: unable to select packages:
  gnome-shell-mobile-99945_git20240426-r1:
    conflicts: gnome-extensions-app-99946.1-r1[cmd:gnome-extensions-app=99945_git20240426-r1]
    satisfies: postmarketos-ui-gnome-mobile-2-r4[gnome-shell-mobile]
               gnome-extensions-app-99946.1-r1[gnome-shell]
               gdm-9999-r0[gnome-shell]
  gnome-extensions-app-99946.1-r1:
    conflicts: gnome-shell-mobile-99945_git20240426-r1[cmd:gnome-extensions-app=99946.1-r1]
    satisfies: world[gnome-extensions-app]

A dependency on this extensions app was added recently in a65e2710 (cc @pabloyoyoista), and I've since rebased the systemd staging branch to pull in that change, which is why it's failing now.