really fix test for old JRuby #2608

Job	Run time
activate	1s
build (ubuntu-latest, jruby-9.4.5.0, ~> 2.3.0)	1m 55s
build (ubuntu-latest, 2.3, ~> 2.3.0)	34s
build (ubuntu-latest, 2.7, ~> 2.3.0)	40s
build (ubuntu-latest, 3.0, ~> 2.3.0)	18s
build (windows-latest, jruby-9.4.5.0, ~> 2.3.0)	4m 16s
build (windows-latest, 2.3, ~> 2.3.0)	1m 56s
build (windows-latest, 2.7, ~> 2.3.0)	2m 37s
build (windows-latest, 3.0, ~> 2.3.0)	2m 36s
build (windows-latest, 3.3, ~> 2.3.0)	3m 20s
build (ubuntu-latest, truffleruby-22.2.0)	1m 28s
build (ubuntu-latest, jruby-9.1.17.0)	1m 48s
build (windows-latest, jruby-9.1.17.0)	3m 29s
build (macos-latest, 3.3)	24s
build (ubuntu-latest, 2.3, ~> 1.0.0)	32s
build (ubuntu-latest, 2.3, ~> 5.2.0)	49s
build (ubuntu-latest, 2.3, ~> 1.2.0)	44s
build (ubuntu-latest, 2.3, ~> 2.0.0)	37s
build (ubuntu-latest, 3.3, primary)	45s
build:dependents	7s
	28m 56s

Provide feedback