Support `Ractor#value` #406

Job	Run time
ruby-versions / Generate Ruby versions	4s
windows-latest 2.7	1m 44s
windows-latest 3.0	1m 18s
windows-latest 3.1	1m 22s
windows-latest 3.2	1m 20s
windows-latest 3.3	1m 21s
windows-latest 3.4	1m 8s
windows-latest jruby-head	2m 9s
windows-latest mingw	1m 2s
windows-latest mswin	1m 10s
	12m 38s

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