Add `cooldown` settings for Dependabot #8843

Job	Run time
Split workflow (ubuntu-latest, nightly-latest)	1m 26s
Split workflow (macos-latest, default)	1m 51s
Split workflow (ubuntu-latest, linked)	1m 20s
Split workflow (macos-latest, linked)	2m 28s
Split workflow (ubuntu-latest, default)	1m 14s
Split workflow (macos-latest, nightly-latest)	1m 49s
	10m 8s

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