zookeeper: 3.4.11 -> 3.4.12

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

This update was made based on information from https://repology.org/metapackage/zookeeper/versions.

These checks were done:

- built on NixOS
- ran ‘/nix/store/g0fmbsp2n6sgh4fa9k6w2m3ndq9vhcxl-zookeeper-3.4.12/bin/zkServer.sh -h’ got 0 exit code
- ran ‘/nix/store/g0fmbsp2n6sgh4fa9k6w2m3ndq9vhcxl-zookeeper-3.4.12/bin/zkServer.sh --help’ got 0 exit code
- ran ‘/nix/store/g0fmbsp2n6sgh4fa9k6w2m3ndq9vhcxl-zookeeper-3.4.12/bin/zkServer.sh help’ got 0 exit code
- ran ‘/nix/store/g0fmbsp2n6sgh4fa9k6w2m3ndq9vhcxl-zookeeper-3.4.12/bin/zkCli.sh help’ got 0 exit code
- found 3.4.12 with grep in /nix/store/g0fmbsp2n6sgh4fa9k6w2m3ndq9vhcxl-zookeeper-3.4.12
- directory tree listing: https://gist.github.com/9a91124b15dbb7aa6469746b3edb67a9

pkgs/servers/zookeeper/default.nix

@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name = "zookeeper-${version}";
-  version = "3.4.11";
+  version = "3.4.12";
 
   src = fetchurl {
     url = "mirror://apache/zookeeper/${name}/${name}.tar.gz";
-    sha256 = "110fs5manyaq6rxbzwzs9x3aqw8d5l4177y9qaj3xhgpr2hniggn";
+    sha256 = "1fcljn2741jw1jvjrk5a0xr8rk69wjwrq522wrc5nmjhj0qzk1n6";
   };
 
   buildInputs = [ makeWrapper jre ];