gnome3_12.clutter-gst: update from 2.0.10 to 2.0.12

pkgs/development/libraries/clutter-gst/default.nix

···
 { fetchurl, stdenv, pkgconfig, clutter, gtk3, glib, cogl }:
 
 stdenv.mkDerivation rec {
-  name = "clutter-gst-2.0.10";
+  name = "clutter-gst-2.0.12";
 
   src = fetchurl {
     url = "mirror://gnome/sources/clutter-gst/2.0/${name}.tar.xz";
-    sha256 = "f00cf492a6d4f1036c70d8a0ebd2f0f47586ea9a9b49b1ffda79c9dc7eadca00";
+    sha256 = "1dgzpd5l5ld622b8185c3khvvllm5hfvq4q1a1mgzhxhj8v4bwf2";
   };
 
   propagatedBuildInputs = [ clutter gtk3 glib cogl ];