fix(deps): update dependency @tryghost/logging to v2.4.15

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@tryghost/logging (source)	2.4.14 -> 2.4.15

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Release Notes

TryGhost/framework (@​tryghost/logging)

### [`v2.4.15`](https://togithub.com/TryGhost/framework/compare/@tryghost/logging@2.4.14...@tryghost/logging@2.4.15) [Compare Source](https://togithub.com/TryGhost/framework/compare/@tryghost/logging@2.4.14...@tryghost/logging@2.4.15)

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