treewide: Add passthru.updateScript to gnome pkgs

`updateScript` lets us update packages automatically.
For packages that are hosted on the gnome mirror it's very easy to add
that. Inspired by https://github.com/NixOS/nixpkgs/issues/36150

pkgs/development/libraries/gnome-menus/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, gettext, glib, gobject-introspection }:
+{ stdenv, fetchurl, pkgconfig, gettext, glib, gobject-introspection, gnome3 }:
 
 stdenv.mkDerivation rec {
   pname = "gnome-menus";
@@ -17,6 +17,12 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig gettext ];
   buildInputs = [ glib gobject-introspection ];
 
+  passthru = {
+    updateScript = gnome3.updateScript {
+      packageName = pname;
+    };
+  };
+
   meta = {
     homepage = https://www.gnome.org;
     description = "Library that implements freedesktops's Desktop Menu Specification in GNOME";