Relationship on correct class when pinning pip
Relationship on correct class when pinning pip

The `python` module doesn't use anchors. So this wouldn't necessarily ensure
that pip was pinned before attempting to install it. By depending on the
`python::install` class, as the `Packager<||>` line below does, it should
enforce the correct order.

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