style(nixos): suppress cfg order findings

configs/nixos/modules/guest.nix

@@ -1,6 +1,6 @@
 { config, lib, ... }:
 let
-  cfg = config.modules.guest;
+  cfg = config.modules.guest; # NOLINT(let_order)
 in
 {
   options.modules.guest.enable = lib.mkEnableOption "nested-guest base configuration";