chore(deps): update dependency marked to v8

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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)) | [`^7.0.0` ->
`^8.0.0`](https://renovatebot.com/diffs/npm/marked/7.0.0/8.0.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/marked/8.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/marked/8.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/marked/7.0.0/8.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/marked/7.0.0/8.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

### [`v8.0.0`](https://togithub.com/markedjs/marked/releases/tag/v8.0.0)

[Compare
Source](https://togithub.com/markedjs/marked/compare/v7.0.5...v8.0.0)

##### Bug Fixes

- remove deprecated options
([#&#8203;2936](https://togithub.com/markedjs/marked/issues/2936))
([22ebdb2](https://togithub.com/markedjs/marked/commit/22ebdb25076b2c94aba49627ab35fbf055163059))

##### Features

- add --config options to marked cli
([#&#8203;2937](https://togithub.com/markedjs/marked/issues/2937))
([fc643a2](https://togithub.com/markedjs/marked/commit/fc643a262564df64f208e0ecbfcdfcae216e880c))

##### BREAKING CHANGES

- deprecated options removed. See
https://marked.js.org/using_advanced#options to see how to enable the
removed options with extensions.

### [`v7.0.5`](https://togithub.com/markedjs/marked/releases/tag/v7.0.5)

[Compare
Source](https://togithub.com/markedjs/marked/compare/v7.0.4...v7.0.5)

##### Bug Fixes

- remove unknown from walkTokens return types
([#&#8203;2955](https://togithub.com/markedjs/marked/issues/2955))
([65934c1](https://togithub.com/markedjs/marked/commit/65934c13caac159027ac070207f094ea293b9426))

### [`v7.0.4`](https://togithub.com/markedjs/marked/releases/tag/v7.0.4)

[Compare
Source](https://togithub.com/markedjs/marked/compare/v7.0.3...v7.0.4)

##### Bug Fixes

- fix more types
([#&#8203;2893](https://togithub.com/markedjs/marked/issues/2893))
([a990c54](https://togithub.com/markedjs/marked/commit/a990c54e0c09a10ba2d6e5a17fe2624d1d97bce3))
- ignore async: false when async: true is set by an extension
([#&#8203;2920](https://togithub.com/markedjs/marked/issues/2920))
([b6ee877](https://togithub.com/markedjs/marked/commit/b6ee877d58efd31bf408a4f8f360554f3406bc20))

### [`v7.0.3`](https://togithub.com/markedjs/marked/releases/tag/v7.0.3)

[Compare
Source](https://togithub.com/markedjs/marked/compare/v7.0.2...v7.0.3)

##### Bug Fixes

- Fix unicode Regex miscounting emoji length
([#&#8203;2942](https://togithub.com/markedjs/marked/issues/2942))
([f3af23e](https://togithub.com/markedjs/marked/commit/f3af23ec988864b486f9852590ce8cc602e491f0))

### [`v7.0.2`](https://togithub.com/markedjs/marked/releases/tag/v7.0.2)

[Compare
Source](https://togithub.com/markedjs/marked/compare/v7.0.1...v7.0.2)

##### Bug Fixes

- fix sourcemaps and circular dependencies
([#&#8203;2929](https://togithub.com/markedjs/marked/issues/2929))
([eb4ce21](https://togithub.com/markedjs/marked/commit/eb4ce2112760d8ef465cfa5654d3503f021bee66))
- noImplicitAny: true
([#&#8203;2891](https://togithub.com/markedjs/marked/issues/2891))
([ff1602c](https://togithub.com/markedjs/marked/commit/ff1602c17843ba614bc8024b905e7a3b51904d2d))

### [`v7.0.1`](https://togithub.com/markedjs/marked/releases/tag/v7.0.1)

[Compare
Source](https://togithub.com/markedjs/marked/compare/v7.0.0...v7.0.1)

##### Bug Fixes

- use rollup to output js files
([#&#8203;2916](https://togithub.com/markedjs/marked/issues/2916))
([610bc45](https://togithub.com/markedjs/marked/commit/610bc45d96f45202fed20a664911d3af48cfe17e))

</details>

---

### Configuration

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Automerge - At any time (no schedule defined).

🚦 **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.

---

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