horizon 18.6.4 release

meta:version: 18.6.4
meta:diff-start: -
meta:series: victoria
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: manchandavishal <manchandavishal143@gmail.com>
meta:release:Commit: manchandavishal <manchandavishal143@gmail.com>
meta:release:Change-Id: I9ea824308fc7e4850883f8108c61795902d5121c
meta:release:Code-Review+2: Hervé Beraud <herveberaud.pro@gmail.com>
meta:release:Code-Review+2: Elod Illes <elod.illes@est.tech>
meta:release:Workflow+1: Elod Illes <elod.illes@est.tech>