[ci] fix brew errors in R macOS jobs (fixes #5670) #5671
Merged
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Fixes #5670.
The only way I could find to work around the issues described in #5670 (comment) was removing
brew update
from the macOS jobs. It seems to be working for now...I think we should do that to at least unblock development here, with the understanding that it might need to be added back in the future.