Update dependency unified to v11.0.4 (#539)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [unified](https://unifiedjs.com) ([source](https://togithub.com/unifiedjs/unified)) | [`11.0.3` -> `11.0.4`](https://renovatebot.com/diffs/npm/unified/11.0.3/11.0.4) | [![age](https://developer.mend.io/api/mc/badges/age/npm/unified/11.0.4?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/unified/11.0.4?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/unified/11.0.3/11.0.4?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/unified/11.0.3/11.0.4?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>unifiedjs/unified (unified)</summary>

### [`v11.0.4`](https://togithub.com/unifiedjs/unified/releases/tag/11.0.4)

[Compare Source](https://togithub.com/unifiedjs/unified/compare/11.0.3...11.0.4)

##### Types

-   [`1ca1a43`](https://togithub.com/unifiedjs/unified/commit/1ca1a43) Add TypeScript declaration maps
    by [@&#8203;remcohaszing](https://togithub.com/remcohaszing) in [https://github.com/unifiedjs/unified/pull/230](https://togithub.com/unifiedjs/unified/pull/230)

**Full Changelog**: unifiedjs/unified@11.0.3...11.0.4

</details>

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.github/actions/validate-docs-links/package.json

@@ -22,7 +22,7 @@
     "rehype-raw": "7.0.0",
     "remark-parse": "11.0.0",
     "remark-rehype": "11.0.0",
-    "unified": "11.0.3",
+    "unified": "11.0.4",
     "unist-util-visit": "5.0.0"
   }
 }