Update dependency next-sanity to v7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
next-sanity	^6.1.3 -> ^7.0.0

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Release Notes

sanity-io/next-sanity (next-sanity)

### [`v7.0.0`](https://togithub.com/sanity-io/next-sanity/blob/HEAD/CHANGELOG.md#700-2023-11-29) [Compare Source](https://togithub.com/sanity-io/next-sanity/compare/v6.1.3...v7.0.0) ##### ⚠ BREAKING CHANGES - remove the deprecated `next-sanity/studio/head` export - **deps:** update dependency [@​sanity/preview-kit](https://togithub.com/sanity/preview-kit) to v5 ([#​782](https://togithub.com/sanity-io/next-sanity/issues/782)) ##### Bug Fixes - **deps:** update dependency [@​sanity/preview-kit](https://togithub.com/sanity/preview-kit) to v5 ([#​782](https://togithub.com/sanity-io/next-sanity/issues/782)) ([b2eb9cf](https://togithub.com/sanity-io/next-sanity/commit/b2eb9cf50879cbd0b3493cd3eb7ac2a70c6839e7)) - remove the deprecated `next-sanity/studio/head` export ([130a1ec](https://togithub.com/sanity-io/next-sanity/commit/130a1ec6d15c460585c81426efce27c87cc4f8db))

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