ssw: 0.6 -> 0.8

Helps to build pspp 1.4.1 -> 1.6.2

pkgs/applications/misc/ssw/default.nix

···
 
 stdenv.mkDerivation rec {
   pname = "ssw";
-  version = "0.6";
+  version = "0.8";
 
   src = fetchurl {
     url = "https://alpha.gnu.org/gnu/ssw/spread-sheet-widget-${version}.tar.gz";
-    sha256 = "08ck9l697xg8vpya5h07raq837i4pqxjqzx30vhscq4xpps2b8kj";
+    sha256 = "sha256-hYnYKY/PO1hQ0JaLBIAaT0D68FVVRPbMnZVLAWLplUs=";
   };
 
   nativeBuildInputs = [ pkg-config ];