Use ruby-core-tasks #411

Job	Run time
ruby-versions / Generate Ruby versions	2s
windows-latest 2.7	1m 46s
windows-latest 3.0	1m 19s
windows-latest 3.1	1m 17s
windows-latest 3.2	1m 18s
windows-latest 3.3	1m 10s
windows-latest 3.4	1m 12s
windows-latest jruby-head	1m 51s
windows-latest mingw	1m 5s
windows-latest mswin	59s
	11m 59s

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