gnome: rename from gnome3

Since GNOME version is now 40, it no longer makes sense to use the old attribute name.

pkgs/development/libraries/glibmm/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, pkg-config, gnum4, glib, libsigcxx, gnome3, darwin, meson, ninja }:
+{ lib, stdenv, fetchurl, pkg-config, gnum4, glib, libsigcxx, gnome, darwin, meson, ninja }:
 
 stdenv.mkDerivation rec {
   pname = "glibmm";
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
   doCheck = false; # fails. one test needs the net, another /etc/fstab
 
   passthru = {
-    updateScript = gnome3.updateScript {
+    updateScript = gnome.updateScript {
       packageName = pname;
       versionPolicy = "odd-unstable";
     };