Bump golang.org/x/tools from 0.19.0 to 0.20.0 #2343

Job	Run time
Unit Test (knative/serving)	9m 15s
Unit Test (knative/networking)	4m 5s
Unit Test (knative/eventing)	13m 6s
Unit Test (knative/operator)	7m 38s
Unit Test (knative/client)	7m 26s
Unit Test (knative-extensions/eventing-autoscaler-keda)	5m 6s
Unit Test (knative-extensions/eventing-ceph)	4m 43s
Unit Test (knative-extensions/eventing-github)	5m 30s
Unit Test (knative-extensions/eventing-gitlab)	5m 3s
Unit Test (knative-extensions/eventing-kafka)	6m 53s
Unit Test (knative-extensions/eventing-kafka-broker)	9m 33s
Unit Test (knative-extensions/eventing-redis)	5m 55s
Unit Test (knative-extensions/kn-plugin-admin)	4m 47s
Unit Test (knative-extensions/net-certmanager)	4m 41s
Unit Test (knative-extensions/net-contour)	4m 49s
Unit Test (knative-extensions/net-istio)	5m 57s
Unit Test (knative-extensions/net-kourier)	4m 45s
	1h 49m 12s

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