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Update CONTRIBUTING.md (#1148) #48

Job	Run time
builds / compute-tags	2s
builds / build-nodejs18 / Build image	1m 50s
builds / build-operator / Build image	3m 22s
builds / build-nodejs20 / Build image	2m 16s
builds / build-python312 / Build image	2m 21s
builds / build-python39 / Build image	2m 28s
builds / build-serverless-jobinit / Build image	2m 21s
builds / build-serverless-controller / Build image	3m 17s
builds / build-serverless-webhook / Build image	2m 26s
integrations / gardener-integration-test	12m 45s
integrations / serverless-integration-test	10m 18s
integrations / git-auth-integration-test	3m 16s
integrations / operator-integration-test	2m 27s
upgrades / operator-upgrade-test	2m 50s
upgrades / serverless-upgrade-test	11m 49s
	1h 3m 48s

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