Bump performanceplatform-collector library
Bump performanceplatform-collector library

PR is failing to build (alphagov/stagecraft#426)
due to performanceplatform-collector repo not
recognising the latest version of the gapy client.
In an attempt to resolve this,
performanceplatform-collector and gapy client
have been bumped and so updating the version
of performanceplatform-collector in this repo.

alphagov/stagecraft,alphagov/stagecraft,alphagov/stagecraft,alphagov/stagecraft