chore(deps): update dependency marked to v7 (#343)

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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)) | [`^6.0.0` ->
`^7.0.0`](https://renovatebot.com/diffs/npm/marked/6.0.0/7.0.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/marked/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/marked/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/marked/6.0.0/7.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|

---

### Release Notes

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

### [`v7.0.0`](https://togithub.com/markedjs/marked/releases/tag/v7.0.0)

[Compare
Source](https://togithub.com/markedjs/marked/compare/v6.0.0...v7.0.0)

##### Bug Fixes

- change defaults for mangle and headerIds to false
([#&#8203;2890](https://togithub.com/markedjs/marked/issues/2890))
([63a839b](https://togithub.com/markedjs/marked/commit/63a839b8cba6caec311a0a7d608be9217b22be05))

##### BREAKING CHANGES

-   change defaults for mangle and headerIds to false

</details>

---

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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": "^6.0.0",
+    "marked": "^7.0.0",
     "prismjs": "^1.16.0",
     "react": "^17.0.2",
     "react-debounce-render": "^8.0.0",