stats/otel: upgrade grpc version that contains the experimental/stats package #11644

Job	Run time
vet-proto	25s
tests (vet, 1.22)	2m 35s
tests (extras, 1.22)	2m 46s
tests (tests, 1.22)	3m 58s
tests (tests, 1.22, -race)	5m 46s
tests (tests, 1.22, -race -tags=buffer_pooling)	5m 46s
tests (tests, 1.22, 386)	5m 12s
tests (tests, 1.22, arm64)	6m 32s
tests (tests, 1.21)	2m 14s
	35m 14s

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