FileUtils is needed #1794

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (3.0)	1m 36s
test (3.4)	1m 45s
test (debug)	6m 2s
test (2.7)	1m 52s
test (head)	1m 50s
test (3.3)	1m 40s
test (3.1)	1m 48s
test (3.2)	1m 43s
	18m 20s

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