musescore: 2.1 -> 3.6.2.548020600 on darwin

- Release: https://github.com/musescore/MuseScore/releases/tag/v3.6.2
- Bump musescore to 3.6.2.548020600
- Update download url
- Change license to gpl3

pkgs/applications/audio/musescore/darwin.nix

@@ -1,7 +1,7 @@
 { stdenv, lib, fetchurl, undmg }:
 
 let
-  versionComponents = [ "2" "1" ];
+  versionComponents = [ "3" "6" "2" "548020600" ];
   appName = "MuseScore ${builtins.head versionComponents}";
 in
 
@@ -15,8 +15,8 @@ stdenv.mkDerivation rec {
   sourceRoot = "${appName}.app";
 
   src = fetchurl {
-    url =  "ftp://ftp.osuosl.org/pub/musescore/releases/MuseScore-${concatStringsSep "." (take 3 versionComponents)}/MuseScore-${version}.dmg";
-    sha256 = "19xkaxlkbrhvfip6n3iw6q7463ngr6y5gfisrpjqg2xl2igyl795";
+    url =  "https://github.com/musescore/MuseScore/releases/download/v${concatStringsSep "." (take 3 versionComponents)}/MuseScore-${version}.dmg";
+    sha256 = "sha256-lHckfhTTrDzaGwlbnZ5w0O1gMPbRmrmgATIGMY517l0=";
   };
 
   buildInputs = [ undmg ];
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "Music notation and composition software";
     homepage = "https://musescore.org/";
-    license = licenses.gpl2;
+    license = licenses.gpl3Only;
     platforms = platforms.darwin;
     maintainers = [];
   };