chore(deps): update dependency markdown-it-anchor to v9 (#440)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [markdown-it-anchor](https://github.com/valeriangalliat/markdown-it-anchor) | devDependencies | major | [`^8.6.7` -> `^9.0.0`](https://renovatebot.com/diffs/npm/markdown-it-anchor/8.6.7/9.0.1) |

---

### Release Notes

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

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

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

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

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

[Compare Source](https://github.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://github.com/valeriangalliat/markdown-it-anchor/issues/129)], \[[#&#8203;128](https://github.com/valeriangalliat/markdown-it-anchor/issues/128)])

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "every weekend" (UTC), Automerge - "before 4am" (UTC).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy40MDguMSIsInVwZGF0ZWRJblZlciI6IjM3LjQwOC4xIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJkZXBlbmRlbmN5Il19-->

Co-authored-by: woodpecker-bot <woodpecker-bot@obermui.de>
Co-authored-by: Patrick Schratz <pat-s@noreply.codeberg.org>
Reviewed-on: https://codeberg.org/Codeberg/Documentation/pulls/440
Co-authored-by: Dependency bot <renovate-bot@noreply.codeberg.org>
Co-committed-by: Dependency bot <renovate-bot@noreply.codeberg.org>

package.json

@@ -16,7 +16,7 @@
     "@fortawesome/free-solid-svg-icons": "^6.4.0",
     "@toycode/markdown-it-class": "^1.2.4",
     "@uncenter/eleventy-plugin-toc": "^1.0.3",
-    "markdown-it-anchor": "^8.6.7",
+    "markdown-it-anchor": "^9.0.0",
     "pagefind": "^1.0.4"
   }
 }