[chore] skip v1.68.0 of grpc dep (#36577) #46501

Job	Run time
docker-build	6m 15s
collector-build	6m 17s
kubernetes-test-matrix (v1.30.0, receiver/k8sclusterreceiver)	6m 43s
kubernetes-test-matrix (v1.30.0, processor/k8sattributesprocessor)	6m 25s
kubernetes-test-matrix (v1.30.0, receiver/kubeletstatsreceiver)	4m 1s
kubernetes-test-matrix (v1.30.0, receiver/k8sobjectsreceiver)	3m 3s
kubernetes-test-matrix (v1.23.17, receiver/k8sclusterreceiver)	6m 31s
kubernetes-test-matrix (v1.23.17, processor/k8sattributesprocessor)	6m 39s
kubernetes-test-matrix (v1.23.17, receiver/kubeletstatsreceiver)	4m 4s
kubernetes-test-matrix (v1.23.17, receiver/k8sobjectsreceiver)	3m 19s
supervisor-test	1m 2s
kubernetes-test	1s
	54m 20s

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