gnome: rename from gnome3

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

pkgs/development/libraries/libwnck/3.x.nix

@@ -16,7 +16,7 @@
 , libstartup_notification
 , gettext
 , gobject-introspection
-, gnome3
+, gnome
 }:
 
 stdenv.mkDerivation rec {
@@ -60,7 +60,7 @@ stdenv.mkDerivation rec {
   ];
 
   passthru = {
-    updateScript = gnome3.updateScript {
+    updateScript = gnome.updateScript {
       packageName = pname;
       attrPath = "${pname}${lib.versions.major version}";
       versionPolicy = "odd-unstable";