bump go.etcd.io/etcd to v3.5.16 #3733

Job	Run time
Basic Checks	2m 56s
Unit Tests	8m 34s
Integration Tests (raft)	12m 19s
Integration Tests (pvtdata)	11m 44s
Integration Tests (pvtdatapurge e2e)	11m 10s
Integration Tests (ledger)	12m 29s
Integration Tests (lifecycle)	5m 56s
Integration Tests (smartbft)	20m 4s
Integration Tests (discovery gossip devmode pluggable)	6m 51s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	19m 18s
Integration Tests (sbe nwo msp)	7m 22s
	1h 58m 43s

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