FileUtils is needed #1792

Job	Run time
ruby-versions / Generate Ruby versions	3s
test (3.2)	1m 51s
test (3.3)	1m 58s
test (3.1)	1m 48s
test (3.4)	1m 42s
test (head)	1m 44s
test (3.0)	1m 42s
test (debug)	6m 10s
test (2.7)	1m 51s
	18m 49s

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