Merge branch 'update-packer-docker-image' into 'main'

Update packer version to v1.9.4

See merge request rc/packer-openstack-hpc-image!69

Dockerfile

@@ -4,7 +4,7 @@ ENV S3CMD_VER=2.3.0
 ENV ANSIBLE_VER=4.10.0
 ENV OSC_VER=5.8.0
 ENV TF_VER=1.4.6
-ENV PACKER_VER=1.8.3
+ENV PACKER_VER=1.9.4
 
 RUN apt-get update && apt-get install --no-install-recommends -y \
     git \