Update Linux versions on build machines
The x64 and x86 Linux VMs for Jenkins are running Ubuntu 16.04, which is EOL coming April. If we have not switched to GitLab for builds by then, we should update to a later version.
The x64 and x86 Linux VMs for Jenkins are running Ubuntu 16.04, which is EOL coming April. If we have not switched to GitLab for builds by then, we should update to a later version.