spin: update from 6.4.1 to 6.4.3

pkgs/development/tools/analysis/spin/default.nix

···
 
 stdenv.mkDerivation rec {
   name = "spin-${version}";
-  version = "6.4.1";
+  version = "6.4.3";
   url-version = stdenv.lib.replaceChars ["."] [""] version;
 
   src = fetchurl {
     url = "http://spinroot.com/spin/Src/spin${url-version}.tar.gz";
     curlOpts = "--user-agent 'Mozilla/5.0'";
-    sha256 = "02r2jazb2hnhcqcjnmlj6sjd9dvyfalgi99bzncwfadixf3hmpvn";
+    sha256 = "0cldhxvfw6llh4spcx0x0535pffx89pvvxpdi0bpqy9a6da85ln1";
   };
 
   buildInputs = [ yacc ];