Update packer build job python version to 3.8

Change-Id: Ie12f31febc74626a7d319ef434036ec7e0cff30a
1 file changed
tree: 858ce44086dc4df6348bb6716e05b3932968c6bb
  1. jjb/
  2. .gitignore
  3. .gitreview
  4. .yamllint
  5. tox.ini