mysql_jdbc: add passthru.updateScript

pkgs/servers/sql/mysql/jdbc/default.nix

···
-{ lib, stdenv, fetchurl, ant, unzip }:
+{ lib, stdenv, fetchurl, ant, unzip, gitUpdater }:
 
 stdenv.mkDerivation rec {
   pname = "mysql-connector-java";
···
   nativeBuildInputs = [ unzip ];
 
   buildInputs = [ ant ];
+
+  passthru.updateScript = gitUpdater {
+    url = "https://github.com/mysql/mysql-connector-j.git";
+  };
 
   meta = with lib; {
     description = "MySQL Connector/J";