style: utilise keep-sorted formatter

modules/nixos/features/intel-gpu.nix

@@ -14,11 +14,13 @@ in
       graphics = {
         enable = true;
         extraPackages = with pkgs; [
+          # keep-sorted start 
           intel-media-driver
           libva-vdpau-driver
           intel-compute-runtime
           vpl-gpu-rt
           intel-ocl
+          # keep-sorted end 
         ];
       };
     };