[#62377060] Pin the Puppet version
[#62377060] Pin the Puppet version

Pins the Puppet version so that APT won't install a new version that
could break Puppet. If Puppet broke, it would not be capable of
enforcing the package versions set here.

Pins the `puppet`, `puppet-common` and `facter` packages.

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