czmq: depend on lz4

[iMichka]

Fixes:
brew linkage
Broken dependencies:
/usr/local/opt/lz4/lib/liblz4.1.dylib (lz4)

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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[p-linnane]

I fixed the syntax, but the job is failing right now due to the Actions outage. Will circle back.

[github-actions]

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