postgresql16Packages.pg_libversion: add update script

pkgs/servers/sql/postgresql/ext/pg_libversion.nix

@@ -1,6 +1,7 @@
  { lib
 , stdenv
 , fetchFromGitHub
+, gitUpdater
 , pkg-config
 , postgresql
 , libversion
@@ -36,6 +37,8 @@ stdenv.mkDerivation (finalAttrs: {
     runHook postInstall
   '';
 
+  passthru.updateScript = gitUpdater { };
+
   meta = with lib; {
     description = "PostgreSQL extension with support for version string comparison";
     homepage = "https://github.com/repology/postgresql-libversion";