fix(deps): update dependency @tryghost/image-transform to v1.2.11

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@tryghost/image-transform (source)	1.2.10 -> 1.2.11

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Release Notes

TryGhost/SDK (@​tryghost/image-transform)

### [`v1.2.11`](https://togithub.com/TryGhost/SDK/compare/@tryghost/image-transform@1.2.10...@tryghost/image-transform@1.2.11) [Compare Source](https://togithub.com/TryGhost/SDK/compare/@tryghost/image-transform@1.2.10...@tryghost/image-transform@1.2.11)

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