Use ruby-core-tasks #410

Job	Run time
ruby-versions / Generate Ruby versions	3s
windows-latest 2.7	1m 43s
windows-latest 3.0	1m 13s
windows-latest 3.1	1m 13s
windows-latest 3.2	1m 13s
windows-latest 3.3	1m 36s
windows-latest 3.4	1m 12s
windows-latest jruby-head	1m 54s
windows-latest mingw	1m 9s
windows-latest mswin	1m 5s
	12m 21s

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