Bump the apt module version from 1.1 to 1.4

At this version the apt module also includes a
apt::unattended_upgrades class that we might be able to use
to deprecate our home-spun unattended_upgrades module.

Change-Id: Idd6f3a935cf4d543ee10d909900c8e01947e8ced
Merge "Bump the apt module version from 1.1 to 1.4"