ubuntu_font_family: update from 0.80 to 0.83, potentially fixes CVE-2012-5356

pkgs/data/fonts/ubuntu-font-family/default.nix

···
 { stdenv, fetchurl, unzip }:
 
 stdenv.mkDerivation rec {
-  name = "ubuntu-font-family-0.80";
+  name = "ubuntu-font-family-0.83";
   buildInputs = [unzip];
 
   src = fetchurl {
     url = "http://font.ubuntu.com/download/${name}.zip";
-    sha256 = "0k4f548riq23gmw4zhn30qqkcpaj4g2ab5rbc3lflfxwkc4p0w8h";
+    sha256 = "0hjvq2x758dx0sfwqhzflns0ns035qm7h6ygskbx1svzg517sva5";
   };
 
   installPhase =