horizon 19.4.0 release

meta:version: 19.4.0
meta:diff-start: -
meta:series: wallaby
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: manchandavishal <manchandavishal143@gmail.com>
meta:release:Commit: Vishal Manchanda <manchandavishal143@gmail.com>
meta:release:Change-Id: I1765bab313faf4593ffa142966adb94d09960303
meta:release:Code-Review+2: Elod Illes <elod.illes@est.tech>
meta:release:Code-Review+2: Hervé Beraud <herveberaud.pro@gmail.com>
meta:release:Workflow+1: Hervé Beraud <herveberaud.pro@gmail.com>