neutron 9.4.0 release

meta:version: 9.4.0
meta:diff-start: -
meta:series: newton
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Ihar Hrachyshka <ihrachys@redhat.com>
meta:release:Commit: Ihar Hrachyshka <ihrachys@redhat.com>
meta:release:Change-Id: I2cb192d3e33dbbb50a4ed6c44ff7153a98825358
meta:release:Code-Review+2: Alan Pevec <alan.pevec@redhat.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Alan Pevec <alan.pevec@redhat.com>
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