cargo-mutants: add nix-update-script

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

@@ -2,6 +2,7 @@
   lib,
   rustPlatform,
   fetchFromGitHub,
+  nix-update-script,
 }:
 
 rustPlatform.buildRustPackage (finalAttrs: {
@@ -20,6 +21,8 @@ rustPlatform.buildRustPackage (finalAttrs: {
   # too many tests require internet access
   doCheck = false;
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "Mutation testing tool for Rust";
     mainProgram = "cargo-mutants";