polyml: 5.5.2 -> 5.6

pkgs/development/compilers/polyml/default.nix

···
 {stdenv, fetchurl, autoreconfHook}:
 
 let
-  version = "5.5.2";
+  version = "5.6";
 in
 
 stdenv.mkDerivation {
···
 
   src = fetchurl {
     url = "mirror://sourceforge/polyml/polyml.${version}.tar.gz";
-    sha256 = "10m680qdad6bd50bav9xjsgmsxw8yxg55vr7grbg0gvykzl2pzbk";
+    sha256 = "05d6l2a5m9jf32a8kahwg2p2ph4x9rjf1nsl83331q3gwn5bkmr0";
   };
 
   meta = {