Bump actions/checkout from 4.1.7 to 4.2.0 #561

Job	Run time
ruby-versions / Generate Ruby versions	1s
test (ubuntu-latest, 2.3)	44s
test (ubuntu-latest, 2.4)	44s
test (ubuntu-latest, 2.5)	42s
test (ubuntu-latest, 2.6)	48s
test (ubuntu-latest, 2.7)	48s
test (ubuntu-latest, 3.0)	15s
test (ubuntu-latest, 3.1)	15s
test (ubuntu-latest, 3.2)	16s
test (ubuntu-latest, 3.3)	19s
test (ubuntu-latest, head)	18s
test (ubuntu-latest, jruby)	4m 3s
test (ubuntu-latest, jruby-head)	4m 14s
test (ubuntu-latest, truffleruby)	59s
test (windows-latest, 2.3)	2m 5s
test (windows-latest, 2.4)	2m 14s
test (windows-latest, 2.5)	3m 14s
test (windows-latest, 2.6)	3m 50s
test (windows-latest, 2.7)	3m 43s
test (windows-latest, 3.0)	1m 25s
test (windows-latest, 3.1)	1m 31s
test (windows-latest, 3.2)	2m 15s
test (windows-latest, 3.3)	2m 7s
test (windows-latest, head)	1m 33s
	38m 23s

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