[ci] update to R 4.1.3 and use macOS-latest for R jobs (fixes #4990) #5137
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Fixes #4990.
Contributes to #3763.
Based on #5129 (comment).
Updates R r.x CI jobs to R 4.1.2 (released last month).
Changes R 4.1 Mac CI jobs back to
macOS-latest
environment (reverting a workaround from #4989).