Support `Ractor#value` #408

Job	Run time
ruby-versions / Generate Ruby versions	4s
windows-latest 2.7	1m 9s
windows-latest 3.0	51s
windows-latest 3.1	42s
windows-latest 3.2	43s
windows-latest 3.3	54s
windows-latest 3.4	42s
windows-latest jruby-head	1m 47s
windows-latest mingw	38s
windows-latest mswin	59s
	8m 29s

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