macmon: add nix-update-script

Makes it easier to update the package down the line,
especially with the versionCheckHook checking if it compiled correctly!

pkgs/by-name/ma/macmon/package.nix

@@ -3,6 +3,7 @@
   rustPlatform,
   fetchFromGitHub,
   versionCheckHook,
+  nix-update-script,
 }:
 
 rustPlatform.buildRustPackage (finalAttrs: {
@@ -23,6 +24,8 @@ rustPlatform.buildRustPackage (finalAttrs: {
   ];
   doInstallCheck = true;
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "Sudoless performance monitoring for Apple Silicon processors";
     homepage = "https://github.com/vladkens/macmon";