bump github.com/prometheus/client_golang to v1.20.5 #3776

Job	Run time
Basic Checks	1m 15s
Unit Tests	23m 46s
Integration Tests (raft)	12m 49s
Integration Tests (pvtdata)	12m 0s
Integration Tests (pvtdatapurge e2e)	11m 33s
Integration Tests (ledger)	13m 50s
Integration Tests (lifecycle)	6m 11s
Integration Tests (smartbft)	20m 30s
Integration Tests (discovery gossip devmode pluggable)	5m 55s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	17m 25s
Integration Tests (sbe nwo msp)	7m 55s
	2h 13m 9s

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