boringtun: test

[ZhongRuoyu]

This is only to test boringtun after #125208. Its test timed out on ARM Ventura only (logs).

• 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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[ZhongRuoyu]

Huh, Intel Big Sur this time: https://github.com/Homebrew/homebrew-core/actions/runs/4404048557/jobs/7713294327

[ZhongRuoyu]

During the first run, only Intel Big Sur failed; during the second run, ARM Ventura and Intel Monterey failed. The test seems to be a bit fragile, but since it actually can work, I'm going to conclude this unless I (or someone else) figure out why, and come up with a better fix sometime.