bump github.com/alecthomas/kingpin/v2 to v2.4.0 #3738

Job	Run time
Basic Checks	3m 23s
Unit Tests	8m 47s
Integration Tests (raft)	12m 54s
Integration Tests (pvtdata)	11m 52s
Integration Tests (pvtdatapurge e2e)	11m 5s
Integration Tests (ledger)	13m 15s
Integration Tests (lifecycle)	6m 46s
Integration Tests (smartbft)	20m 7s
Integration Tests (discovery gossip devmode pluggable)	7m 7s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	16m 52s
Integration Tests (sbe nwo msp)	7m 58s
	2h 0m 6s

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