bump github.com/prometheus/client_golang to v1.20.5 #530

Job	Run time
Basic Checks	1m 15s
Basic Checks	1m 15s
Unit Tests	23m 18s
Unit Tests	22m 50s
Integration Tests (raft)	11m 44s
Integration Tests (raft)	11m 44s
Integration Tests (pvtdata)	10m 49s
Integration Tests (pvtdata)	10m 49s
Integration Tests (pvtdatapurge e2e)	9m 50s
Integration Tests (pvtdatapurge e2e)	9m 50s
Integration Tests (ledger)	12m 16s
Integration Tests (ledger)	12m 16s
Integration Tests (lifecycle)	5m 8s
Integration Tests (lifecycle)	5m 8s
Integration Tests (smartbft)	19m 12s
Integration Tests (smartbft)	19m 12s
Integration Tests (discovery gossip devmode pluggable)	5m 23s
Integration Tests (discovery gossip devmode pluggable)	5m 23s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	18m 20s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	18m 20s
Integration Tests (sbe nwo msp)	6m 39s
Integration Tests (sbe nwo msp)	6m 39s
	4h 7m 20s

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