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ARROW-7105: [CI][Crossbow] Nightly homebrew-cpp job fails

This turns off ARROW_S3, which seems to be the cause of the failure.

Closes #5846 from nealrichardson/unbreak-homebrew-cpp and squashes the following commits:

311acffb9 <Neal Richardson> Fix brew audit error
d2c6d9022 <Neal Richardson> Revert "Also don't depend on aws-sdk-cpp for now"
92c42dbcd <Neal Richardson> Also don't depend on aws-sdk-cpp for now
69573cd33 <Neal Richardson> Turn off ARROW_S3 in homebrew-cpp because it errors

Authored-by: Neal Richardson <neal.p.richardson@gmail.com>
Signed-off-by: Neal Richardson <neal.p.richardson@gmail.com>