.github/labeler.yml: Update GNOME file patterns

This got missed in the move (https://github.com/NixOS/nixpkgs/pull/122107) because it is in a “hidden” directory.

.github/labeler.yml

@@ -36,11 +36,11 @@
 
 "6.topic: GNOME":
   - doc/languages-frameworks/gnome.section.md
-  - nixos/modules/services/desktops/gnome3/**/*
-  - nixos/modules/services/x11/desktop-managers/gnome3.nix
-  - nixos/tests/gnome3-xorg.nix
-  - nixos/tests/gnome3.nix
-  - pkgs/desktops/gnome-3/**/*
+  - nixos/modules/services/desktops/gnome/**/*
+  - nixos/modules/services/x11/desktop-managers/gnome.nix
+  - nixos/tests/gnome-xorg.nix
+  - nixos/tests/gnome.nix
+  - pkgs/desktops/gnome/**/*
 
 "6.topic: golang":
   - doc/languages-frameworks/go.section.md