services/horizon: Update changelog for Horizon v22 release #4329

Job	Run time
Integration tests (ubuntu-20.04, 1.21, 12, 21)	56m 3s
Test (and push) verify-range image	2m 19s
Integration tests (ubuntu-20.04, 1.21, 12, 22)	57m 16s
Integration tests (ubuntu-20.04, 1.21, 16, 21)	56m 21s
Integration tests (ubuntu-20.04, 1.21, 16, 22)	57m 46s
Integration tests (ubuntu-20.04, 1.22, 12, 21)	53m 42s
Integration tests (ubuntu-20.04, 1.22, 12, 22)	56m 54s
Integration tests (ubuntu-20.04, 1.22, 16, 21)	56m 22s
Integration tests (ubuntu-20.04, 1.22, 16, 22)	56m 29s
Integration tests (ubuntu-22.04, 1.21, 12, 21)	50m 24s
Integration tests (ubuntu-22.04, 1.21, 12, 22)	53m 4s
Integration tests (ubuntu-22.04, 1.21, 16, 21)	56m 27s
Integration tests (ubuntu-22.04, 1.21, 16, 22)	56m 11s
Integration tests (ubuntu-22.04, 1.22, 12, 21)	56m 19s
Integration tests (ubuntu-22.04, 1.22, 12, 22)	54m 33s
Integration tests (ubuntu-22.04, 1.22, 16, 21)	52m 15s
Integration tests (ubuntu-22.04, 1.22, 16, 22)	55m 57s
	14h 48m 22s

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