grpc: fix 1.74 build for darwin: drop redundant patch (#434404)

pkgs/by-name/gr/grpc/package.nix

@@ -3,7 +3,6 @@
   stdenv,
   fetchFromGitHub,
   fetchpatch,
-  fetchurl,
   buildPackages,
   cmake,
   zlib,
@@ -54,11 +53,6 @@ stdenv.mkDerivation rec {
   ++ lib.optionals stdenv.hostPlatform.isDarwin [
     # fix build of 1.63.0 and newer on darwin: https://github.com/grpc/grpc/issues/36654
     ./dynamic-lookup-darwin.patch
-    # https://github.com/grpc/grpc/issues/39170
-    (fetchurl {
-      url = "https://raw.githubusercontent.com/rdhafidh/vcpkg/0ae97b7b81562bd66ab99d022551db1449c079f9/ports/grpc/00017-add-src-upb.patch";
-      hash = "sha256-0zaJqeCM90DTtUR6xCUorahUpiJF3D/KODYkUXQh2ok=";
-    })
   ];
 
   nativeBuildInputs = [