Bump github.com/tsenart/vegeta/v12 from 12.11.1 to 12.11.3 #2428

Job	Run time
Unit Test (knative/serving)	9m 57s
Unit Test (knative/networking)	4m 3s
Unit Test (knative/eventing)	13m 20s
Unit Test (knative/operator)	6m 45s
Unit Test (knative/client)	6m 50s
Unit Test (knative-extensions/eventing-autoscaler-keda)	4m 37s
Unit Test (knative-extensions/eventing-ceph)	5m 15s
Unit Test (knative-extensions/eventing-github)	5m 22s
Unit Test (knative-extensions/eventing-gitlab)	5m 1s
Unit Test (knative-extensions/eventing-kafka-broker)	10m 27s
Unit Test (knative-extensions/eventing-rabbitmq)	10m 18s
Unit Test (knative-extensions/eventing-redis)	5m 44s
Unit Test (knative-extensions/kn-plugin-admin)	4m 17s
Unit Test (knative-extensions/net-certmanager)	4m 14s
Unit Test (knative-extensions/net-contour)	4m 31s
Unit Test (knative-extensions/net-istio)	5m 4s
Unit Test (knative-extensions/net-kourier)	4m 30s
	1h 50m 15s

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