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Bump ruby/setup-ruby from 1.281.0 to 1.284.0 in /.github/workflows in the actions-minor group across 1 directory #8760

Job	Run time
Split workflow (ubuntu-latest, linked)	1m 15s
Split workflow (ubuntu-latest, nightly-latest)	1m 21s
Split workflow (ubuntu-latest, default)	1m 14s
Split workflow (macos-latest, default)	1m 55s
Split workflow (macos-latest, nightly-latest)	1m 25s
Split workflow (macos-latest, linked)	2m 7s
	9m 17s