Tweak JRuby option #108

Job	Run time
ruby-versions / Generate Ruby versions	3s
test (2.5, ubuntu-latest)	42s
test (2.5, windows-latest)	3m 0s
test (2.6, ubuntu-latest)	46s
test (2.6, macos-latest)	47s
test (2.6, windows-latest)	3m 7s
test (2.7, ubuntu-latest)	42s
test (2.7, macos-latest)	45s
test (2.7, windows-latest)	3m 9s
test (3.0, ubuntu-latest)	18s
test (3.0, macos-latest)	16s
test (3.0, windows-latest)	1m 43s
test (3.1, ubuntu-latest)	22s
test (3.1, macos-latest)	17s
test (3.1, windows-latest)	1m 12s
test (3.2, ubuntu-latest)	20s
test (3.2, macos-latest)	21s
test (3.2, windows-latest)	1m 43s
test (3.3, ubuntu-latest)	16s
test (3.3, macos-latest)	17s
test (3.3, windows-latest)	1m 57s
test (head, ubuntu-latest)	17s
test (head, macos-latest)	18s
test (head, windows-latest)	1m 27s
test (jruby, ubuntu-latest)	1m 15s
test (jruby, macos-latest)	1m 0s
test (jruby, windows-latest)	2m 45s
test (jruby-head, ubuntu-latest)	1m 15s
test (jruby-head, macos-latest)	58s
test (jruby-head, windows-latest)	2m 45s
test (windows-latest, ucrt)	1m 2s
test (windows-latest, mingw)	1m 28s
test (windows-latest, mswin)	2m 59s
test (macos-13, 2.5)	1m 26s
	40m 58s

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