zeromq: add dependency on libsodium

[nightlark]

Using TweetNaCl can result in shutdown errors from libzmq (particularly when used in multithreaded programs), and it is not recommended for "production" use. Using libsodium is the default recommended by the libzmq maintainers as per the discussion in: zeromq/libzmq#2991 (comment)

Also adds the SPDX license LGPL-3.0-or-later: https://github.com/zeromq/libzmq#license

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[nightlark]

Oh oops. I'd searched for libzmq and zmq when checking for open PRs. #66238 shows up when looking for zeromq.

I could turn this into a PR that just adds the license info, then the other change could wait until @minrk splits his changes into separate commits?

[carlocab]

There's been no response on that other PR for 10 days. I think you're fine to keep the libsodium dependency change. The other PR can just be rebased onto master if yours gets merged first.

[SMillerDev]

Thanks @nightlark ! Without contributions like yours it'd be impossible to keep homebrew going with the high standards that users have come to expect from the project. You can feel good knowing that you've made the world a tiny bit better for homebrew users around the world! 👍 🎉

[BrewTestBot]

🤖 A scheduled task has triggered a merge.