Update dependency @tryghost/release-utils to v0.6.9

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@tryghost/release-utils	0.6.8 -> 0.6.9

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Release Notes

TryGhost/Ghost-Utils

### [`v0.6.9`](https://togithub.com/TryGhost/Ghost-Utils/compare/@tryghost/release-utils@0.6.8...@tryghost/release-utils@0.6.9) [Compare Source](https://togithub.com/TryGhost/Ghost-Utils/compare/@tryghost/release-utils@0.6.8...@tryghost/release-utils@0.6.9)

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