[#54693536] Update development VBox image
[#54693536] Update development VBox image

Includes Puppet 3.4 installed from a Debian package:
https://github.com/alphagov/boxes/pull/4

This will be downloaded automatically the next time someone brings up a box
(`vagrant up`) from fresh (clean install or after `vagrant destroy`).

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet