Use irb as a gem #48

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (3.4, windows-latest)	2m 51s
build (3.4, macos-latest)	17s
build (head, ubuntu-latest)	15s
build (3.4, ubuntu-latest)	17s
build (head, macos-latest)	20s
	4m 2s

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