frog-protocols: fix update script

pkgs/by-name/fr/frog-protocols/package.nix

···
   lib,
   meson,
   ninja,
-  nix-update-script,
+  unstableGitUpdater,
   stdenv,
   testers,
 }:
···
   ];
 
   passthru = {
-    updateScript = nix-update-script { };
+    updateScript = unstableGitUpdater { };
     tests.pkg-config = testers.hasPkgConfigModules { package = finalAttrs.finalPackage; };
   };