fix(deps): update dependency @tryghost/kg-default-cards to v9.1.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@tryghost/kg-default-cards (source)	9.1.7 -> 9.1.8

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Release Notes

TryGhost/Koenig (@​tryghost/kg-default-cards)

### [`v9.1.8`](https://togithub.com/TryGhost/Koenig/compare/@tryghost/kg-default-cards@9.1.7...@tryghost/kg-default-cards@9.1.8) [Compare Source](https://togithub.com/TryGhost/Koenig/compare/@tryghost/kg-default-cards@9.1.7...@tryghost/kg-default-cards@9.1.8)

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