Support `Ractor#value` (#134) #409

Job	Run time
ruby-versions / Generate Ruby versions	2s
windows-latest 2.7	1m 39s
windows-latest 3.0	1m 9s
windows-latest 3.1	1m 21s
windows-latest 3.2	1m 12s
windows-latest 3.3	1m 26s
windows-latest 3.4	1m 9s
windows-latest jruby-head	1m 59s
windows-latest mingw	1m 0s
windows-latest mswin	1m 2s
	11m 59s

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