checkstyle: 6.13 -> 6.14.1

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

···
 { stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
-  version = "6.13";
+  version = "6.14.1";
   name = "checkstyle-${version}";
 
   src = fetchurl {
     url = "mirror://sourceforge/checkstyle/${name}-bin.tar.gz";
-    sha256 = "0k53kj0mx0shypagny134yrhkjgawzs5yixaxv87br52ablcqdvx";
+    sha256 = "1dcg7libqs797v6x5vdvvc44rqfvwcjh125wczy9v87nl8imc2l3";
   };
 
   installPhase = ''