omit on older version #457

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (debug)	1m 2s
test (3.3)	45s
test (3.0)	45s
test (3.4)	48s
test (head)	48s
test (3.2)	46s
test (3.1)	49s
	5m 47s

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