Fixing installation behavior of brew for auto updater. Brew has deprecated cask use --cask instead.

[philippkahr]

PR Summary

#3131 this issue is resolved by this PR.

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[andyleejordan]

I unfortunately don't yet have a MacOS device on which to test this, but after reviewing the brew manual, it looks correct. I have prior bad experience with how quickly the brew tool changes its CLI, with deprecations and removals happening within months. It is not a stable API by any means, and so scripting around it is nigh-impossible to keep correct. That said, this PR isn't adding that problem, it's simply dealing with its ramifications, so thank you for this contribution, I will merge it. I wish there were stable tooling for MacOS we could use instead.