ingest/ledgerbackend: Add version check for protocol 21 #3859

Job	Run time
Test and push the Ledger Exporter images	1m 19s
Test and push the Ledger Exporter images	1m 19s
Integration tests (ubuntu-20.04, 1.21, 12, 21)	1h 6m 45s
Integration tests (ubuntu-20.04, 1.21, 12, 21)	55m 19s
Test (and push) verify-range image	2m 16s
Test (and push) verify-range image	2m 16s
Integration tests (ubuntu-20.04, 1.21, 16, 21)	55m 4s
Integration tests (ubuntu-20.04, 1.21, 16, 21)	55m 4s
Integration tests (ubuntu-20.04, 1.22, 12, 21)	56m 30s
Integration tests (ubuntu-20.04, 1.22, 12, 21)	56m 30s
Integration tests (ubuntu-20.04, 1.22, 16, 21)	54m 32s
Integration tests (ubuntu-20.04, 1.22, 16, 21)	54m 32s
Integration tests (ubuntu-22.04, 1.21, 12, 21)	55m 28s
Integration tests (ubuntu-22.04, 1.21, 12, 21)	55m 28s
Integration tests (ubuntu-22.04, 1.21, 16, 21)	56m 47s
Integration tests (ubuntu-22.04, 1.21, 16, 21)	56m 47s
Integration tests (ubuntu-22.04, 1.22, 12, 21)	54m 47s
Integration tests (ubuntu-22.04, 1.22, 12, 21)	54m 47s
Integration tests (ubuntu-22.04, 1.22, 16, 21)	55m 20s
Integration tests (ubuntu-22.04, 1.22, 16, 21)	55m 20s
	15h 6m 10s

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