fix windows ci #490

Job	Run time
build (3.0, ubuntu-latest, spec)	2m 5s
build (3.0, windows-latest, spec)	19m 33s
build (3.1, ubuntu-latest, spec)	1m 39s
build (3.1, windows-latest, spec)	7m 23s
build (3.2, ubuntu-latest, spec)	1m 47s
build (3.2, windows-latest, spec)	8m 30s
build (3.3, ubuntu-latest, spec)	2m 49s
build (3.3, windows-latest, spec)	14m 27s
build (head, ubuntu-latest, spec)	11s
build (head, windows-latest, spec)	1m 28s
build (jruby-head, ubuntu-latest, spec)	13m 30s
build (jruby-head, windows-latest, spec)	2m 44s
build (3.0, ubuntu-latest, rubocop)	13s
	1h 16m 19s

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