My module depends on the Fcntl module (https://github.com/manchicken/perl6-Fcntl), which hasn't been updated in a long time and is broken. However, there's a fork (https://github.com/jonathanstowe/perl6-Fcntl) that works for me if I zef install it manually. Is it possible to specify the dependency in my module's META-6.json such that the correct github repo will be used for installing the module?