[ci] run 'brew update' in macOS jobs (fixes #4160)#4161

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jameslamb merged 2 commits intomasterfrom fix/mac-ci

Apr 5, 2021

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Commits on Apr 4, 2021

[ci] run 'brew update' in macOS jobs (fixes #4160 )
jameslamb
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Commits on Apr 5, 2021

move update
jameslamb
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