Bump Go to 1.21.6 (release-2.2) (#4652) #2799

Job	Run time
Basic Checks	2m 11s
Unit Tests	5m 28s
Integration Tests (raft)	10m 22s
Integration Tests (pvtdata)	12m 53s
Integration Tests (ledger)	8m 46s
Integration Tests (lifecycle)	10m 1s
Integration Tests (e2e)	7m 41s
Integration Tests (discovery gossip devmode pluggable)	9m 11s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	2m 48s
Integration Tests (sbe nwo msp)	11m 9s
	1h 20m 30s

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