add cooldown to Dependabot updates #1949

Job	Run time
old-dependencies	36s
lint	27s
test (ubuntu-latest, 3.10.18)	2m 12s
test (windows-latest, 3.14.0, --cov-fail-under=100)	1m 28s
test (ubuntu-latest, 3.14.0, --cov-fail-under=100)	59s
build / build	20s
test (macos-latest, 3.14.0, --cov-fail-under=100)	1m 16s
test (ubuntu-latest, 3.11.13)	2m 16s
test (ubuntu-latest, 3.12.11)	1m 40s
test (ubuntu-latest, 3.13.7)	1m 15s
attest	9s
check / check	5s
deploy	0s
	12m 43s

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