Suppress warnings against pattern matching on ruby 2.7 #574

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-24.04 2.7	48s
ubuntu-24.04 3.0	12s
ubuntu-24.04 3.3	23s
ubuntu-24.04 3.2	15s
ubuntu-24.04 3.1	19s
ubuntu-24.04 3.4	17s
ubuntu-24.04 jruby-head	1m 11s
ubuntu-24.04 head	18s
ubuntu-24.04 truffleruby-head	24s
ubuntu-24.04 debug	20s
ubuntu-22.04 2.7	44s
ubuntu-22.04 3.0	17s
ubuntu-22.04 3.4	28s
ubuntu-22.04 3.3	14s
ubuntu-22.04 head	16s
ubuntu-22.04 3.1	20s
ubuntu-22.04 debug	24s
ubuntu-22.04 3.2	17s
ubuntu-22.04 truffleruby-head	39s
ubuntu-22.04 jruby-head	1m 9s
	9m 19s

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