Update dependency eslint-plugin-ghost to v2.15.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
eslint-plugin-ghost	2.14.0 -> 2.15.1

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Release Notes

TryGhost/eslint-plugin-ghost

### [`v2.15.1`](https://togithub.com/TryGhost/eslint-plugin-ghost/compare/v2.15.0...v2.15.1) [Compare Source](https://togithub.com/TryGhost/eslint-plugin-ghost/compare/v2.15.0...v2.15.1) ### [`v2.15.0`](https://togithub.com/TryGhost/eslint-plugin-ghost/compare/v2.14.0...v2.15.0) [Compare Source](https://togithub.com/TryGhost/eslint-plugin-ghost/compare/v2.14.0...v2.15.0)

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