rosegarden: 20.06 -> 20.12

pkgs/applications/audio/rosegarden/default.nix

···
 , liblo, libsamplerate, libsndfile, lirc ? null, lrdf, qtbase }:
 
 stdenv.mkDerivation (rec {
-  version = "20.06";
+  version = "20.12";
   pname = "rosegarden";
 
   src = fetchurl {
     url = "mirror://sourceforge/rosegarden/${pname}-${version}.tar.bz2";
-    sha256 = "1i9x9rkqwwdrk77xl5ra8i48cjirbc7fbisnj0nnclccwaq0wk6r";
+    sha256 = "sha256-iGaEr8WFipV4I00fhFGI2xMBFPf784IIxNXs2hUTHFs=";
   };
 
   patchPhase = ''