CI: Workaround for test_sound on macos-12 #14715
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Problem
CI: test_sound often fails on macos-12.
Cause
Some of macos-12 runners (machines) have no audio device installed.
On my investigation; macos-12 runner runs on any one of at least 3 machines and 2 of them have no audio device installed.
Therefore, when tests run on such machine, test_sound fails.
Solution
Install an audio device before testing.
This PR adds to the step of installing blackhole-2ch, which is macOS audio driver.