zsh: 5.5 -> 5.5.1

(cherry picked from commit c69eae9a919190d9229b5ae55b82299b74979176)

pkgs/shells/zsh/default.nix

···
 { stdenv, fetchurl, ncurses, pcre }:
 
 let
-  version = "5.5";
+  version = "5.5.1";
 
   documentation = fetchurl {
     url = "mirror://sourceforge/zsh/zsh-${version}-doc.tar.gz";
-    sha256 = "1k56ancx1xxniih8i1gmfhhmmk965jk8wfjdfkynnxfi4pkqy2gc";
+    sha256 = "0bm9n7lycdzvw5hmgi4a920pqbb5yxvmyhfxx8jbign2hzgf7g01";
   };
 
 in
···
 
   src = fetchurl {
     url = "mirror://sourceforge/zsh/zsh-${version}.tar.gz";
-    sha256 = "0nf1cwjgdncz9bln1fdz7m6rlgf8qjy2v01871ifhak78njhcmnh";
+    sha256 = "10705qnnr3p416bwfjaip9r7yw187vczzjrk60yg79dfwy4slk3p";
   };
 
   buildInputs = [ ncurses pcre ];