Try macOS 11 #12

Job	Run time
ruby-versions / Generate Ruby versions	3s
build (2.5 / ubuntu-latest)	22s
build (2.5 / macos-11)	51s
build (2.5 / windows-latest)	2m 46s
build (2.6 / ubuntu-latest)	22s
build (2.6 / macos-11)	53s
build (2.6 / windows-latest)	3m 16s
build (2.7 / ubuntu-latest)	21s
build (2.7 / macos-11)	52s
build (2.7 / windows-latest)	1m 46s
build (3.0 / ubuntu-latest)	10s
build (3.0 / macos-11)	23s
build (3.0 / windows-latest)	1m 43s
build (3.1 / ubuntu-latest)	13s
build (3.1 / macos-11)	24s
build (3.1 / windows-latest)	1m 20s
build (3.2 / ubuntu-latest)	13s
build (3.2 / macos-11)	32s
build (3.2 / windows-latest)	1m 26s
build (3.3 / ubuntu-latest)	13s
build (3.3 / macos-11)	26s
build (3.3 / windows-latest)	1m 18s
build (head / ubuntu-latest)	13s
build (head / macos-11)	24s
build (truffleruby-head / ubuntu-latest)	28s
build (truffleruby-head / macos-11)	51s
build (mswin / windows-latest)	1m 16s
build (mingw / windows-latest)	57s
	24m 2s

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