[#62547120] Upgrade unicornherder to 0.0.8
[#62547120] Upgrade unicornherder to 0.0.8

The latest version of unicornherder will play more nicely with Unicorn's
PID switching behaviour, which is something we probably want for slow
starting hot reloads.

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