Merge pull request #77 from eregon/back-to-macos-latest #156

Job	Run time
ruby-versions / Generate Ruby versions	3s
build (2.5 / ubuntu-latest)	21s
build (2.5 / macos-latest)	1m 13s
build (2.5 / windows-latest)	3m 23s
build (2.6 / ubuntu-latest)	26s
build (2.6 / macos-latest)	1m 1s
build (2.6 / windows-latest)	2m 8s
build (2.7 / ubuntu-latest)	25s
build (2.7 / macos-latest)	48s
build (2.7 / windows-latest)	1m 51s
build (3.0 / ubuntu-latest)	12s
build (3.0 / macos-latest)	28s
build (3.0 / windows-latest)	1m 49s
build (3.1 / ubuntu-latest)	18s
build (3.1 / macos-latest)	21s
build (3.1 / windows-latest)	1m 42s
build (3.2 / ubuntu-latest)	9s
build (3.2 / macos-latest)	32s
build (3.2 / windows-latest)	1m 41s
build (3.3 / ubuntu-latest)	13s
build (3.3 / macos-latest)	21s
build (3.3 / windows-latest)	1m 39s
build (head / ubuntu-latest)	11s
build (head / macos-latest)	23s
build (truffleruby-head / ubuntu-latest)	32s
build (truffleruby-head / macos-latest)	1m 35s
build (mswin / windows-latest)	1m 46s
build (mingw / windows-latest)	1m 42s
	27m 13s

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