bump github.com/prometheus/client_golang to v1.20.5 #3775

Job	Run time
Basic Checks	1m 7s
Integration Tests (raft)	12m 22s
Unit Tests	23m 35s
Integration Tests (pvtdata)	11m 50s
Integration Tests (pvtdatapurge e2e)	11m 2s
Integration Tests (ledger)	13m 40s
Integration Tests (lifecycle)	6m 18s
Integration Tests (smartbft)	20m 36s
Integration Tests (discovery gossip devmode pluggable)	6m 53s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	20m 44s
Integration Tests (sbe nwo msp)	8m 34s
	2h 16m 41s

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