Bump golang.org/x/oauth2 from 0.19.0 to 0.20.0 #2363

Job	Run time
Unit Test (knative/serving)	10m 2s
Unit Test (knative/networking)	3m 57s
Unit Test (knative/eventing)	13m 12s
Unit Test (knative/operator)	6m 51s
Unit Test (knative/client)	6m 43s
Unit Test (knative-extensions/eventing-autoscaler-keda)	4m 54s
Unit Test (knative-extensions/eventing-ceph)	4m 50s
Unit Test (knative-extensions/eventing-github)	5m 41s
Unit Test (knative-extensions/eventing-gitlab)	5m 2s
Unit Test (knative-extensions/eventing-kafka)	6m 45s
Unit Test (knative-extensions/eventing-kafka-broker)	11m 25s
Unit Test (knative-extensions/eventing-rabbitmq)	10m 11s
Unit Test (knative-extensions/eventing-redis)	5m 41s
Unit Test (knative-extensions/kn-plugin-admin)	4m 16s
Unit Test (knative-extensions/net-certmanager)	4m 26s
Unit Test (knative-extensions/net-contour)	4m 28s
Unit Test (knative-extensions/net-istio)	6m 9s
Unit Test (knative-extensions/net-kourier)	4m 27s
	1h 59m 0s

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