Bump github.com/gorilla/websocket from 1.5.1 to 1.5.2 #2389

Job	Run time
Unit Test (knative/serving)	9m 45s
Unit Test (knative/networking)	3m 56s
Unit Test (knative/eventing)	13m 41s
Unit Test (knative/operator)	6m 51s
Unit Test (knative/client)	7m 8s
Unit Test (knative-extensions/eventing-autoscaler-keda)	4m 43s
Unit Test (knative-extensions/eventing-ceph)	4m 47s
Unit Test (knative-extensions/eventing-github)	5m 42s
Unit Test (knative-extensions/eventing-gitlab)	4m 59s
Unit Test (knative-extensions/eventing-kafka)	6m 52s
Unit Test (knative-extensions/eventing-kafka-broker)	11m 31s
Unit Test (knative-extensions/eventing-rabbitmq)	10m 20s
Unit Test (knative-extensions/eventing-redis)	5m 40s
Unit Test (knative-extensions/kn-plugin-admin)	4m 42s
Unit Test (knative-extensions/net-certmanager)	4m 27s
Unit Test (knative-extensions/net-contour)	4m 41s
Unit Test (knative-extensions/net-istio)	5m 55s
Unit Test (knative-extensions/net-kourier)	4m 26s
	2h 0m 6s

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