FileUtils is needed #462

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (3.1)	51s
test (3.3)	50s
test (3.0)	48s
test (debug)	1m 4s
test (3.4)	54s
test (3.2)	43s
test (head)	45s
	5m 59s

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