zsh-completion-sync: add updateScript (#515525)

pkgs/by-name/zs/zsh-completion-sync/package.nix

@@ -2,6 +2,7 @@
   stdenvNoCC,
   lib,
   fetchFromGitHub,
+  gitUpdater,
 }:
 
 stdenvNoCC.mkDerivation (finalAttrs: {
@@ -23,6 +24,10 @@ stdenvNoCC.mkDerivation (finalAttrs: {
     install -D zsh-completion-sync.plugin.zsh  $out/share/zsh-completion-sync/zsh-completion-sync.plugin.zsh
   '';
 
+  passthru.updateScript = gitUpdater {
+    rev-prefix = "v";
+  };
+
   meta = {
     description = "Automatically loads completions added dynamically to FPATH or XDG_DATA_DIRS";
     homepage = "https://github.com/BronzeDeer/zsh-completion-sync";