ci: set dependabot cooldown #1874

Job	Run time
java_matrix	3s
build (macos-latest)	3m 7s
download_test_data	4s
build (ubuntu-latest)	2m 59s
unit_tests (21)	2m 59s
unit_tests (25)	2m 57s
generate_documentation	1m 0s
dependency_analysis	1m 2s
test_clara	4m 2s
test_run-groovy	35s
test_decoder	2m 48s
test_coatjava (ubuntu-latest, kpp)	3m 5s
test_coatjava (ubuntu-latest, eb-enc)	2m 20s
spotbugs	6m 23s
test_coatjava (ubuntu-latest, eb-epc)	2m 14s
test_coatjava (ubuntu-latest, eb-eftpi)	1m 52s
test_coatjava (ubuntu-latest, eb-ep)	2m 10s
test_coatjava (ubuntu-latest, eb-eg)	2m 6s
test_coatjava (macos-latest, eb-ep, ./run-eb-tests.sh -100 electronproton)	3m 36s
release_build	-1s
deploy_web_pages	0s
final	3s
	45m 24s

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