Bump actions/checkout from 3 to 4 #1677

Job	Run time
lint	16s
spec (alpine-latest, 3.0)	36s
spec (alpine-latest, 3.1)	48s
spec (alpine-latest, 3.2)	39s
spec (alpine-latest, 3.3-rc)	44s
spec (macos-latest, 3.0)	1m 10s
spec (macos-latest, 3.1)	42s
spec (macos-latest, 3.2)	1m 18s
spec (macos-latest, 3.3)	1m 26s
spec (macos-latest, jruby)	2m 52s
spec (macos-latest, truffleruby)	3m 40s
spec (macos-latest, truffleruby+graalvm)	6m 15s
spec (ubuntu-latest, 3.0)	26s
spec (ubuntu-latest, 3.1)	23s
spec (ubuntu-latest, 3.2)	22s
spec (ubuntu-latest, 3.3)	43s
spec (ubuntu-latest, jruby)	2m 4s
spec (ubuntu-latest, truffleruby)	2m 7s
spec (ubuntu-latest, truffleruby+graalvm)	3m 40s
spec (windows-latest, 3.0)	2m 12s
spec (windows-latest, 3.1)	2m 0s
spec (windows-latest, 3.2)	3m 16s
spec (windows-latest, jruby)	4m 42s
release	0s
	42m 21s

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