fix(deps): update dependency hast-util-to-html to v9 (#53)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[hast-util-to-html](https://togithub.com/syntax-tree/hast-util-to-html)
| [`^8.0.4` ->
`^9.0.0`](https://renovatebot.com/diffs/npm/hast-util-to-html/8.0.4/9.0.0)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/hast-util-to-html/9.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/hast-util-to-html/9.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/hast-util-to-html/8.0.4/9.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/hast-util-to-html/8.0.4/9.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>syntax-tree/hast-util-to-html (hast-util-to-html)</summary>

###
[`v9.0.0`](https://togithub.com/syntax-tree/hast-util-to-html/releases/tag/9.0.0)

[Compare
Source](https://togithub.com/syntax-tree/hast-util-to-html/compare/8.0.4...9.0.0)

##### Change

-
[`23a91fc`](https://togithub.com/syntax-tree/hast-util-to-html/commit/23a91fc)
Update `@types/hast`, utilities
    **migrate**: update too
-
[`8c32af8`](https://togithub.com/syntax-tree/hast-util-to-html/commit/8c32af8)
Change to require Node.js 16
    **migrate**: update too
-
[`320b2ff`](https://togithub.com/syntax-tree/hast-util-to-html/commit/320b2ff)
Change to use `exports`
    **migrate**: don’t use private APIs
-
[`15b1618`](https://togithub.com/syntax-tree/hast-util-to-html/commit/15b1618)
Remove `entities` option, use `characterReferences`
    **migrate**: `options.entities` -> `options.characterReferences`

**Full Changelog**:
syntax-tree/hast-util-to-html@8.0.4...9.0.0

</details>

---

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package.json

@@ -28,7 +28,7 @@
     "directory-tree": "^3.2.2",
     "fs": "^0.0.1-security",
     "fuse.js": "^6.6.2",
-    "hast-util-to-html": "^8.0.4",
+    "hast-util-to-html": "^9.0.0",
     "jotai": "^2.0.1",
     "katex": "^0.16.4",
     "mermaid": "^10.0.2",