omit on older version #1787

Job	Run time
ruby-versions / Generate Ruby versions	3s
test (3.1)	2m 4s
test (3.0)	1m 54s
test (3.4)	1m 48s
test (3.3)	1m 50s
test (3.2)	1m 44s
test (head)	1m 44s
test (debug)	6m 9s
test (2.7)	2m 10s
	19m 26s

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