cargo-benchcmp: add nix-update-script

pkgs/by-name/ca/cargo-benchcmp/package.nix

@@ -4,6 +4,7 @@
   fetchFromGitHub,
   replaceVars,
   stdenv,
+  nix-update-script,
 }:
 
 rustPlatform.buildRustPackage (finalAttrs: {
@@ -31,6 +32,8 @@ rustPlatform.buildRustPackage (finalAttrs: {
     "--skip=different_input_colored"
   ];
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "Small utility to compare Rust micro-benchmarks";
     mainProgram = "cargo-benchcmp";