test

Bump ruby/setup-ruby from 1.218.0 to 1.221.0 #633

Job	Run time
ruby-versions / Generate Ruby versions	5s
test (ubuntu-latest, 2.3)	44s
test (ubuntu-latest, 2.4)	37s
test (ubuntu-latest, 2.5)	40s
test (ubuntu-latest, 2.6)	47s
test (ubuntu-latest, 2.7)	43s
test (ubuntu-latest, 3.0)	16s
test (ubuntu-latest, 3.1)	15s
test (ubuntu-latest, 3.2)	14s
test (ubuntu-latest, 3.3)	16s
test (ubuntu-latest, 3.4)	13s
test (ubuntu-latest, head)	14s
test (ubuntu-latest, jruby)	4m 2s
test (ubuntu-latest, jruby-head)	3m 55s
test (ubuntu-latest, truffleruby)	48s
test (windows-latest, 2.3)	2m 2s
test (windows-latest, 2.4)	2m 39s
test (windows-latest, 2.5)	2m 32s
test (windows-latest, 2.6)	3m 48s
test (windows-latest, 2.7)	3m 30s
test (windows-latest, 3.0)	1m 56s
test (windows-latest, 3.1)	2m 46s
test (windows-latest, 3.2)	1m 19s
test (windows-latest, 3.3)	1m 29s
test (windows-latest, 3.4)	2m 39s
test (windows-latest, head)	2m 17s
	40m 46s

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