Fixes for JRuby release build #385

Job	Run time
ruby-versions / Generate Ruby versions	3s
windows-latest 2.7	2m 22s
windows-latest 3.0	2m 1s
windows-latest 3.1	1m 36s
windows-latest 3.2	1m 42s
windows-latest 3.3	3m 11s
windows-latest 3.4	2m 28s
windows-latest jruby-head	3m 6s
windows-latest mingw	2m 7s
windows-latest mswin	1m 49s
	20m 25s

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