➕ Add "irb" to Gemfile to silence warning #1836

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (3.1 / ubuntu-latest)	41s
build (3.1 / macos-latest)	31s
build (3.1 / windows-latest)	2m 18s
build (3.2 / ubuntu-latest)	57s
build (3.2 / macos-latest)	36s
build (3.2 / windows-latest)	2m 26s
build (3.3 / ubuntu-latest)	41s
build (3.3 / macos-latest)	34s
build (3.3 / windows-latest)	1m 59s
build (3.4 / ubuntu-latest)	43s
build (3.4 / macos-latest)	41s
build (3.4 / windows-latest)	3m 21s
build (head / ubuntu-latest)	45s
build (head / macos-latest)	35s
build (head / windows-latest)	2m 31s
	19m 21s

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