Update dependency shiki to v1.6.0 (#3803)

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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))
| [`1.5.2` ->
`1.6.0`](https://renovatebot.com/diffs/npm/shiki/1.5.2/1.6.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/shiki/1.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/shiki/1.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/shiki/1.5.2/1.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/shiki/1.5.2/1.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

### [`v1.6.0`](https://togithub.com/shikijs/shiki/releases/tag/v1.6.0)

[Compare
Source](https://togithub.com/shikijs/shiki/compare/v1.5.2...v1.6.0)

#####    🚀 Features

- Scoped color replacements  -  by
[@&#8203;QuentinRoy](https://togithub.com/QuentinRoy) in
[shikijs/shiki#680
[<samp>(ed31e)</samp>](https://togithub.com/shikijs/shiki/commit/ed31ee55)
- New `regexp` grammar  -  by
[@&#8203;antfu](https://togithub.com/antfu)
[<samp>(8ea85)</samp>](https://togithub.com/shikijs/shiki/commit/8ea85136)

#####     [View changes on
GitHub](https://togithub.com/shikijs/shiki/compare/v1.5.2...v1.6.0)

</details>

---

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---

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package.json

@@ -173,7 +173,7 @@
     "resolve-from": "5.0.0",
     "rimraf": "5.0.7",
     "sharp": "0.33.4",
-    "shiki": "1.5.2",
+    "shiki": "1.6.0",
     "stripe": "15.7.0",
     "stylelint": "16.5.0",
     "stylelint-config-standard": "36.0.0",