Use private lookup for these handles #338

Job	Run time
ruby-versions / Generate Ruby versions	2s
windows-latest 2.7	3m 46s
windows-latest 3.0	1m 19s
windows-latest 3.1	1m 31s
windows-latest 3.2	1m 47s
windows-latest 3.3	1m 22s
windows-latest 3.4	2m 33s
windows-latest mingw	1m 39s
windows-latest mswin	1m 47s
	15m 46s

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