bump github.com/syndtr/goleveldb to 126854af5e6d #3732

Job	Run time
Basic Checks	3m 2s
Unit Tests	24m 34s
Integration Tests (raft)	12m 40s
Integration Tests (pvtdata)	11m 20s
Integration Tests (pvtdatapurge e2e)	11m 41s
Integration Tests (ledger)	13m 42s
Integration Tests (lifecycle)	5m 40s
Integration Tests (smartbft)	20m 1s
Integration Tests (discovery gossip devmode pluggable)	7m 15s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	16m 26s
Integration Tests (sbe nwo msp)	7m 49s
	2h 14m 10s

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