bespokesynth: Add passthru.updateScript

So updates can be sent automatically by r-ryantm, assuming that no other adjustments are needed to build it.

pkgs/applications/audio/bespokesynth/default.nix

@@ -3,6 +3,7 @@
   stdenv,
   fetchFromGitHub,
   fetchzip,
+  gitUpdater,
   cmake,
   pkg-config,
   ninja,
@@ -168,6 +169,10 @@ stdenv.mkDerivation (finalAttrs: {
 
   dontPatchELF = true; # needed or nix will try to optimize the binary by removing "useless" rpath
 
+  passthru.updateScript = gitUpdater {
+    rev-prefix = "v";
+  };
+
   meta = {
     description = "Software modular synth with controllers support, scripting and VST";
     homepage = "https://www.bespokesynth.com/";