gmm: 5.4.2 -> 5.4.4

pkgs/by-name/gm/gmm/package.nix

···
 
 stdenv.mkDerivation rec {
   pname = "gmm";
-  version = "5.4.2";
+  version = "5.4.4";
 
   src = fetchurl {
     url = "mirror://savannah/getfem/stable/${pname}-${version}.tar.gz";
-    sha256 = "sha256-UgbnMmQ/aTQQkCiy8XNmDywu3LDuJpIo1pSsym4iyIo=";
+    sha256 = "sha256-FesZQwEbkmZaqzsC7PPO3hz4nqFakAb4HyuizWYqoCs=";
   };
 
   meta = with lib; {