chore(deps): update dependency markdown-it-anchor to v9 (#760)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[markdown-it-anchor](https://togithub.com/valeriangalliat/markdown-it-anchor)
| [`^8.6.7` ->
`^9.0.0`](https://renovatebot.com/diffs/npm/markdown-it-anchor/8.6.7/9.0.1)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/markdown-it-anchor/9.0.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/markdown-it-anchor/9.0.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/markdown-it-anchor/8.6.7/9.0.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/markdown-it-anchor/8.6.7/9.0.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>valeriangalliat/markdown-it-anchor
(markdown-it-anchor)</summary>

###
[`v9.0.1`](https://togithub.com/valeriangalliat/markdown-it-anchor/blob/HEAD/CHANGELOG.md#901---2024-05-17)

[Compare
Source](https://togithub.com/valeriangalliat/markdown-it-anchor/compare/v9.0.0...v9.0.1)

- Fix types following upgrade.
(\[[#&#8203;131](https://togithub.com/valeriangalliat/markdown-it-anchor/issues/131)])

###
[`v9.0.0`](https://togithub.com/valeriangalliat/markdown-it-anchor/blob/HEAD/CHANGELOG.md#900---2024-05-16)

[Compare
Source](https://togithub.com/valeriangalliat/markdown-it-anchor/compare/v8.6.7...v9.0.0)

- Support markdown-it 14. This may be breaking hence the major.
(\[[#&#8203;129](https://togithub.com/valeriangalliat/markdown-it-anchor/issues/129)],
\[[#&#8203;128](https://togithub.com/valeriangalliat/markdown-it-anchor/issues/128)])

</details>

---

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docs-svelte-kit/package.json

@@ -43,7 +43,7 @@
     "eslint-visitor-keys": "^4.0.0",
     "espree": "^10.0.1",
     "globals": "^15.2.0",
-    "markdown-it-anchor": "^8.6.7",
+    "markdown-it-anchor": "^9.0.0",
     "markdown-it-container": "^4.0.0",
     "markdown-it-emoji": "^3.0.0",
     "pako": "^2.1.0",