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Bump ruby/setup-ruby from 1.286.0 to 1.288.0 in /.github/workflows in the actions-minor group across 1 directory #8964

Job	Run time
Split workflow (macos-latest, linked)	2m 8s
Split workflow (ubuntu-latest, nightly-latest)	1m 17s
Split workflow (macos-latest, nightly-latest)	2m 3s
Split workflow (ubuntu-latest, linked)	1m 17s
Split workflow (ubuntu-latest, default)	1m 16s
Split workflow (macos-latest, default)	1m 51s
	9m 52s