rgx: add passthru.updateScript (#510363)

pkgs/by-name/rg/rgx/package.nix

@@ -3,6 +3,7 @@
   fetchFromGitHub,
   rustPlatform,
   pcre2,
+  nix-update-script,
 }:
 
 rustPlatform.buildRustPackage (finalAttrs: {
@@ -22,6 +23,8 @@ rustPlatform.buildRustPackage (finalAttrs: {
 
   buildFeatures = [ "pcre2-engine" ];
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     homepage = "https://github.com/brevity1swos/rgx";
     description = "Terminal regex tester with real-time matching and multi-engine support";