Bump google.golang.org/grpc from 1.68.0 to 1.69.2 #2491

Job	Run time
Unit Test (knative/serving)	10m 21s
Unit Test (knative/networking)	5m 9s
Unit Test (knative/eventing)	12m 51s
Unit Test (knative/operator)	7m 2s
Unit Test (knative/client)	7m 52s
Unit Test (knative-extensions/eventing-autoscaler-keda)	5m 15s
Unit Test (knative-extensions/eventing-ceph)	5m 33s
Unit Test (knative-extensions/eventing-github)	6m 4s
Unit Test (knative-extensions/eventing-gitlab)	5m 40s
Unit Test (knative-extensions/eventing-kafka-broker)	9m 57s
Unit Test (knative-extensions/eventing-rabbitmq)	8m 22s
Unit Test (knative-extensions/eventing-redis)	6m 1s
Unit Test (knative-extensions/kn-plugin-admin)	5m 26s
Unit Test (knative-extensions/net-certmanager)	5m 0s
Unit Test (knative-extensions/net-contour)	5m 1s
Unit Test (knative-extensions/net-istio)	5m 33s
Unit Test (knative-extensions/net-kourier)	5m 12s
	1h 56m 19s

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