dune_3: drop deprecated apple_sdk

pkgs/development/tools/ocaml/dune/3.nix

@@ -4,7 +4,6 @@
   fetchurl,
   ocaml,
   findlib,
-  darwin,
   ocaml-lsp,
   dune-release,
 }:
@@ -27,10 +26,6 @@ else
       findlib
     ];
 
-    buildInputs = lib.optionals stdenv.hostPlatform.isDarwin [
-      darwin.apple_sdk.frameworks.CoreServices
-    ];
-
     strictDeps = true;
 
     buildFlags = [ "release" ];