mate.mate-user-guide: 1.20.1 -> 1.21.0 (#43173)

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/mate-user-guide/versions.

These checks were done:

- built on NixOS

- 0 of 0 passed binary check by having a zero exit code.
- 0 of 0 passed binary check by having the new version present in output.
- directory tree listing: https://gist.github.com/e4cc1dd609c5e947c5c71615994b8bb9
- du listing: https://gist.github.com/56b98015d6d99b9978906a8d770bcfb0

pkgs/desktops/mate/mate-user-guide/default.nix

@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name = "mate-user-guide-${version}";
-  version = "1.20.1";
+  version = "1.21.0";
 
   src = fetchurl {
     url = "http://pub.mate-desktop.org/releases/${mate.getRelease version}/${name}.tar.xz";
-    sha256 = "1k99cjg54wlipy5bfiv6v6za6gdzmilfvlvb0ingv4p51jp4iddr";
+    sha256 = "0ayg570000calzpj51dwhh5mil11s0nrhl21c0si3sxr8f5cld6q";
   };
 
   nativeBuildInputs = [ itstool intltool libxml2 ];