Update packer version 1.2.3

The minimum recommended version of packer required
for global-jjb packer jobs is 1.2.3 which supports
the `instance_name` configuration.

https://github.com/hashicorp/packer/blob/master/CHANGELOG.md

Change-Id: Ibd9874b8632f16d96b2a07a67235de00ce87ee50
Issue-ID: CIMAN-168
Signed-off-by: Anil Belur <abelur@linuxfoundation.org>
1 file changed