vfkit: use nix-update-script for automated updates

pkgs/by-name/vf/vfkit/package.nix

@@ -4,6 +4,7 @@
   buildGoModule,
   darwin,
   fetchFromGitHub,
+  nix-update-script,
   testers,
   vfkit,
 }:
@@ -45,6 +46,8 @@ buildGoModule rec {
     version = testers.testVersion { package = vfkit; };
   };
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "Simple command line tool to start VMs through the macOS Virtualization framework";
     homepage = "https://github.com/crc-org/vfkit";