Bump actions/checkout from 4 to 5 (#954) #2250

Job	Run time
rubocop	34s
tests (ubuntu-latest, truffleruby-head)	1m 40s
tests (ubuntu-latest, 3.4)	34s
tests (macos-latest, 3.3)	26s
tests (ubuntu-latest, 3.3)	32s
tests (ubuntu-latest, 3.2)	35s
tests (macos-latest, 3.4)	21s
tests (ubuntu-latest, head)	1m 18s
tests (macos-latest, truffleruby)	1m 7s
tests (macos-latest, truffleruby-head)	1m 6s
tests (ubuntu-latest, truffleruby)	1m 46s
tests (macos-latest, 3.2)	21s
tests (macos-latest, head)	1m 3s
	11m 23s

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