synthv1: update from 0.6.1 to 0.6.3

pkgs/applications/audio/synthv1/default.nix

···
 
 stdenv.mkDerivation rec {
   name = "synthv1-${version}";
-  version = "0.6.1";
+  version = "0.6.3";
 
   src = fetchurl {
     url = "mirror://sourceforge/synthv1/${name}.tar.gz";
-    sha256 = "0v9zpa49cdj8ixpppgxz95dbn62v8mamxz6fpl7sdnzfn2l8jr4g";
+    sha256 = "19zyvrvnmi7ahwg121vl2q17j9y8ln6lvpj5wxxcwif5538q75iw";
   };
 
   buildInputs = [ qt4 jack2 lv2 ];