Add `cooldown` settings for Dependabot #8851

Job	Run time
Split workflow (macos-latest, linked)	1m 48s
Split workflow (macos-latest, default)	1m 24s
Split workflow (macos-latest, nightly-latest)	1m 55s
Split workflow (ubuntu-latest, default)	1m 36s
Split workflow (ubuntu-latest, nightly-latest)	1m 29s
Split workflow (ubuntu-latest, linked)	1m 21s
	9m 33s

Provide feedback