Bump actions/checkout from 4 to 5 #2060

Job	Run time
RuboCop	51s
specs (ubuntu, 3.4.4)	1m 42s
specs (windows, 3.2.8)	3m 26s
specs (macos, 3.4.4)	1m 10s
specs (windows, 3.3.8)	3m 6s
specs (ubuntu, 3.2.8)	1m 29s
specs (ubuntu, 3.4.4, --enable-frozen-string-literal)	1m 39s
specs (macos, 3.2.8)	1m 9s
specs (ubuntu, 3.4.4, --parser=parse.y)	1m 53s
specs (ubuntu, 3.3.8)	1m 27s
specs (macos, 3.3.8)	1m 18s
specs (windows, 3.4.4)	2m 56s
	22m 6s

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