Swap key for 40 character fingerprint
Swap key for 40 character fingerprint

`govuk_puppet --test` was failing with:

> Warning: /Apt_key[Add key: A1715D88E1DF1F24 from Apt::Source git]: The id should be a full fingerprint (40 characters), see README.

Derived from viewing:
https://keys.openpgp.org/search?q=0xA1715D88E1DF1F24

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