bump github.com/prometheus/client_golang to v1.20.5 #3768

Job	Run time
Basic Checks	3m 37s
Unit Tests	23m 41s
Integration Tests (raft)	12m 37s
Integration Tests (pvtdata)	12m 10s
Integration Tests (pvtdatapurge e2e)	10m 39s
Integration Tests (ledger)	13m 20s
Integration Tests (lifecycle)	6m 32s
Integration Tests (smartbft)	20m 17s
Integration Tests (discovery gossip devmode pluggable)	6m 37s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	17m 11s
Integration Tests (sbe nwo msp)	7m 40s
	2h 14m 21s

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