Bump google.golang.org/grpc from 1.68.0 to 1.69.2 #2494

Job	Run time
Unit Test (knative/serving)	10m 48s
Unit Test (knative/networking)	4m 55s
Unit Test (knative/eventing)	13m 25s
Unit Test (knative/operator)	7m 14s
Unit Test (knative/client)	7m 20s
Unit Test (knative-extensions/eventing-autoscaler-keda)	5m 48s
Unit Test (knative-extensions/eventing-ceph)	5m 25s
Unit Test (knative-extensions/eventing-github)	6m 14s
Unit Test (knative-extensions/eventing-gitlab)	5m 35s
Unit Test (knative-extensions/eventing-kafka-broker)	10m 15s
Unit Test (knative-extensions/eventing-rabbitmq)	8m 34s
Unit Test (knative-extensions/eventing-redis)	5m 54s
Unit Test (knative-extensions/kn-plugin-admin)	5m 19s
Unit Test (knative-extensions/net-certmanager)	5m 9s
Unit Test (knative-extensions/net-contour)	4m 53s
Unit Test (knative-extensions/net-istio)	5m 41s
Unit Test (knative-extensions/net-kourier)	5m 37s
	1h 58m 6s

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