knot-resolver: 4.1.0 -> 4.2.0

No really significant changes, I'd say:
https://gitlab.labs.nic.cz/knot/knot-resolver/tags/v4.2.0

pkgs/servers/dns/knot-resolver/default.nix

@@ -23,11 +23,11 @@ exportLuaPathsFor = luaPkgs: ''
 
 unwrapped = stdenv.mkDerivation rec {
   name = "knot-resolver-${version}";
-  version = "4.1.0";
+  version = "4.2.0";
 
   src = fetchurl {
     url = "https://secure.nic.cz/files/knot-resolver/${name}.tar.xz";
-    sha256 = "2fe470f9bb1007667cdd448f758087244b7195a0234c2b100a9beeed0a2d3e68";
+    sha256 = "b37ff9ceefbaa4e4527d183fb1bbb63e641d34d9889ce92715128bc1423c7ef4";
   };
 
   outputs = [ "out" "dev" ];