libzip is being removed from brew for being unmaintained

[jeaye]

Warning: lbzip2 has been deprecated because it is not maintained upstream! It will be disabled on 2025-07-03.

We'll need a replacement for libzippp + libzip, which we use for opening jars.

https://github.com/kuba--/zip seems like it could be a good option.

Plus side

libzip, installed from package managers, forced us to link dynamically. Since we'd like to ultimately generate static jank binaries, removing one more dynamic lib is a win. That means we'll want to vendor in the new lib as a submodule, though.