vendor: update grpc to v1.66.3 #4883

Job	Run time
prepare	1s
test / prepare	2m 1s
test / run (containerd, ./frontend/dockerfile, integration)	5m 10s
test / run (containerd, ./frontend/dockerfile, dockerfile)	6m 46s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	5m 30s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	6m 41s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 57s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	6m 56s
test / run (containerd-1.7, ./frontend/dockerfile, integration)	5m 2s
test / run (containerd-1.7, ./frontend/dockerfile, dockerfile)	6m 58s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	5m 9s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	7m 22s
test / run (oci, ./frontend/dockerfile, integration)	4m 37s
test / run (oci, ./frontend/dockerfile, dockerfile)	5m 55s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 25s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	5m 50s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 37s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	5m 49s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 28s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	5m 54s
image (mainline)	5m 8s
image (labs)	5m 11s
release	0s
scout	0s
	1h 54m 27s

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