omit on older version #1788

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (3.0)	1m 42s
test (3.4)	1m 41s
test (debug)	6m 18s
test (3.2)	2m 3s
test (3.3)	1m 58s
test (3.1)	1m 47s
test (2.7)	2m 24s
test (head)	1m 44s
	19m 41s

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