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Bump ruby/setup-ruby from 1.267.0 to 1.268.0 in /.github/workflows in the actions-minor group across 1 directory #8414

Job	Run time
Split workflow (macos-latest, default)	2m 10s
Split workflow (ubuntu-latest, linked)	1m 20s
Split workflow (macos-latest, linked)	2m 21s
Split workflow (macos-latest, nightly-latest)	2m 16s
Split workflow (ubuntu-latest, nightly-latest)	2m 42s
Split workflow (ubuntu-latest, default)	1m 19s
	12m 8s