fix(deps): update dependency shiki to v1.7.0 (#491)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [shiki](https://togithub.com/shikijs/shiki)
([source](https://togithub.com/shikijs/shiki/tree/HEAD/packages/shiki))
| [`1.6.5` ->
`1.7.0`](https://renovatebot.com/diffs/npm/shiki/1.6.5/1.7.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/shiki/1.7.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/shiki/1.7.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/shiki/1.6.5/1.7.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/shiki/1.6.5/1.7.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>shikijs/shiki (shiki)</summary>

### [`v1.7.0`](https://togithub.com/shikijs/shiki/releases/tag/v1.7.0)

[Compare
Source](https://togithub.com/shikijs/shiki/compare/v1.6.5...v1.7.0)

#####    🚀 Features

- **core**: Warning on too many instances, close
[#&#8203;693](https://togithub.com/shikijs/shiki/issues/693)  -  by
[@&#8203;antfu](https://togithub.com/antfu) in
[https://github.com/shikijs/shiki/issues/693](https://togithub.com/shikijs/shiki/issues/693)
[<samp>(412fe)</samp>](https://togithub.com/shikijs/shiki/commit/412fe10e)

#####    🐞 Bug Fixes

- **core**: Add missing `UTF8ToString` function, close
[#&#8203;693](https://togithub.com/shikijs/shiki/issues/693)  -  by
[@&#8203;antfu](https://togithub.com/antfu) in
[https://github.com/shikijs/shiki/issues/693](https://togithub.com/shikijs/shiki/issues/693)
[<samp>(0c891)</samp>](https://togithub.com/shikijs/shiki/commit/0c89157f)

#####     [View changes on
GitHub](https://togithub.com/shikijs/shiki/compare/v1.6.5...v1.7.0)

</details>

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