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Avoid using `-latest` runner labels in CI #11700

Job	Run time
Split workflow (macos-26, default)	1m 58s
Split workflow (ubuntu-26.04, linked)	53s
Split workflow (macos-26, nightly-latest)	2m 2s
Split workflow (macos-26, linked)	2m 5s
Split workflow (ubuntu-26.04, nightly-latest)	1m 12s
Split workflow (ubuntu-26.04, default)	1m 15s
	9m 25s