Bump github.com/tsenart/vegeta/v12 from 12.11.3 to 12.12.0 #2433

Job	Run time
Unit Test (knative/serving)	9m 47s
Unit Test (knative/networking)	4m 17s
Unit Test (knative/eventing)	13m 34s
Unit Test (knative/operator)	6m 54s
Unit Test (knative/client)	7m 20s
Unit Test (knative-extensions/eventing-autoscaler-keda)	5m 8s
Unit Test (knative-extensions/eventing-ceph)	4m 54s
Unit Test (knative-extensions/eventing-github)	5m 53s
Unit Test (knative-extensions/eventing-gitlab)	5m 34s
Unit Test (knative-extensions/eventing-kafka-broker)	10m 57s
Unit Test (knative-extensions/eventing-rabbitmq)	10m 42s
Unit Test (knative-extensions/eventing-redis)	6m 25s
Unit Test (knative-extensions/kn-plugin-admin)	4m 43s
Unit Test (knative-extensions/net-certmanager)	4m 24s
Unit Test (knative-extensions/net-contour)	4m 39s
Unit Test (knative-extensions/net-istio)	5m 37s
Unit Test (knative-extensions/net-kourier)	4m 43s
	1h 55m 31s

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