Update dependency @financial-times/cp-content-pipeline-ui to v6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@​financial-times/cp-content-pipeline-ui	^0.4.0 -> ^6.0.0

:information_source: Find our documentation at https://github.com/Financial-Times/next/wiki/Renovate.

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