pkgs: remove 'digestpp'

I have packaged it upstream.

pkgs/default.nix

@@ -12,8 +12,6 @@ pkgs.lib.makeScope pkgs.newScope (pkgs: {
 
   diff-flake = pkgs.callPackage ./diff-flake { };
 
-  digestpp = pkgs.callPackage ./digestpp { };
-
   dragger = pkgs.callPackage ./dragger { };
 
   drone-rsync = pkgs.callPackage ./drone-rsync { };

pkgs/digestpp/default.nix

@@ -1,31 +0,0 @@
-{ lib
-, fetchFromGitHub
-, stdenv
-}:
-stdenv.mkDerivation {
-  pname = "digestpp";
-  version = "0-unstable-2023-11-07";
-
-  src = fetchFromGitHub {
-    owner = "kerukuro";
-    repo = "digestpp";
-    rev = "ebb699402c244e22c3aff61d2239bcb2e87b8ef8";
-    hash = "sha256-9X/P7DgZB6bSYjQWRli4iAXEFjhmACOVv3EYQrXuH5c=";
-  };
-
-  installPhase = ''
-    runHook preInstall
-
-    mkdir -p $out/include/digestpp
-    cp -r *.hpp algorithm/ detail/ $out/include/digestpp
-
-    runHook postInstall
-  '';
-
-  meta = with lib; {
-    description = "C++11 header-only message digest library";
-    homepage = "https://github.com/kerukuro/digestpp";
-    license = licenses.unlicense;
-    maintainers = with maintainers; [ ambroisie ];
-  };
-}