Suppress warnings against pattern matching on ruby 2.7 #515

Job	Run time
ruby-versions / Generate Ruby versions	4s
windows-latest 2.7	1m 52s
windows-latest 3.0	1m 12s
windows-latest 3.1	1m 2s
windows-latest jruby-head	2m 9s
windows-latest 3.3	1m 4s
windows-latest 3.2	2m 58s
windows-latest mingw	48s
windows-latest mswin	59s
windows-latest 3.4	1m 4s
	13m 12s

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