test

Gemfile: Try with test-unit-ruby-core #171

Job	Run time
ruby-versions / Generate Ruby versions	6s
build (3.3 / macos-latest)	9s
build (3.0 / macos-latest)	13s
build (3.2 / macos-latest)	10s
build (3.2 / ubuntu-latest)	10s
build (3.1 / ubuntu-latest)	6s
build (3.4 / ubuntu-latest)	10s
build (3.0 / ubuntu-latest)	9s
build (3.4 / macos-latest)	10s
build (head / ubuntu-latest)	7s
build (3.3 / ubuntu-latest)	12s
build (head / macos-latest)	9s
build (3.1 / macos-latest)	8s
	1m 59s

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