ingest/ledgerbackend: Add version check for protocol 21 #3840

Job	Run time
Integration tests (ubuntu-20.04, 1.21, 12, 20)	54m 1s
Integration tests (ubuntu-20.04, 1.21, 12, 21)	1h 4m 6s
Test (and push) verify-range image	2m 17s
Test and push the Ledger Exporter images	1m 55s
Integration tests (ubuntu-20.04, 1.21, 16, 20)	55m 41s
Integration tests (ubuntu-20.04, 1.21, 16, 21)	56m 11s
Integration tests (ubuntu-20.04, 1.22, 12, 20)	55m 35s
Integration tests (ubuntu-20.04, 1.22, 12, 21)	58m 10s
Integration tests (ubuntu-20.04, 1.22, 16, 20)	54m 39s
Integration tests (ubuntu-20.04, 1.22, 16, 21)	54m 3s
Integration tests (ubuntu-22.04, 1.21, 12, 20)	54m 57s
Integration tests (ubuntu-22.04, 1.21, 12, 21)	55m 11s
Integration tests (ubuntu-22.04, 1.21, 16, 20)	55m 14s
Integration tests (ubuntu-22.04, 1.21, 16, 21)	55m 18s
Integration tests (ubuntu-22.04, 1.22, 12, 20)	54m 48s
Integration tests (ubuntu-22.04, 1.22, 12, 21)	55m 8s
Integration tests (ubuntu-22.04, 1.22, 16, 20)	57m 4s
Integration tests (ubuntu-22.04, 1.22, 16, 21)	54m 51s
	14h 59m 9s

Provide feedback