chore(deps): update dependency marked to v6 (#335)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [marked](https://marked.js.org)
([source](https://togithub.com/markedjs/marked)) | [`^5.0.0` ->
`^6.0.0`](https://renovatebot.com/diffs/npm/marked/5.1.0/6.0.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/marked/6.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/marked/6.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/marked/5.1.0/6.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/marked/5.1.0/6.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>markedjs/marked (marked)</summary>

### [`v6.0.0`](https://togithub.com/markedjs/marked/releases/tag/v6.0.0)

[Compare
Source](https://togithub.com/markedjs/marked/compare/v5.1.2...v6.0.0)

##### Bug Fixes

- Migrate to Typescript
([#&#8203;2805](https://togithub.com/markedjs/marked/issues/2805))
([cb54906](https://togithub.com/markedjs/marked/commit/cb549065f16fbd4a01bab3292bfd2ab0b116c1b2))

##### BREAKING CHANGES

-   Migrate to Typescript

### [`v5.1.2`](https://togithub.com/markedjs/marked/releases/tag/v5.1.2)

[Compare
Source](https://togithub.com/markedjs/marked/compare/v5.1.1...v5.1.2)

##### Bug Fixes

- Add support for Node 16
([#&#8203;2886](https://togithub.com/markedjs/marked/issues/2886))
([e465ce4](https://togithub.com/markedjs/marked/commit/e465ce48c93c109803fc3071700a75a85d13251f))

### [`v5.1.1`](https://togithub.com/markedjs/marked/releases/tag/v5.1.1)

[Compare
Source](https://togithub.com/markedjs/marked/compare/v5.1.0...v5.1.1)

##### Bug Fixes

- fix typo
([#&#8203;2870](https://togithub.com/markedjs/marked/issues/2870))
([e6a7184](https://togithub.com/markedjs/marked/commit/e6a7184cb6539dbab5bf369989588cb93ffdac38))

</details>

---

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---

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docs/package.json

@@ -18,7 +18,7 @@
     "gatsby-transformer-remark": "^5.23.0",
     "html-react-parser": "^4.0.0",
     "lodash": "^4.17.15",
-    "marked": "^5.0.0",
+    "marked": "^6.0.0",
     "prismjs": "^1.16.0",
     "react": "^17.0.2",
     "react-debounce-render": "^8.0.0",