Add `cooldown` settings for Dependabot #8852

Job	Run time
Split workflow (ubuntu-latest, default)	1m 17s
Split workflow (macos-latest, linked)	2m 33s
Split workflow (ubuntu-latest, nightly-latest)	1m 24s
Split workflow (ubuntu-latest, linked)	1m 20s
Split workflow (macos-latest, default)	1m 47s
Split workflow (macos-latest, nightly-latest)	2m 3s
	10m 24s

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