Update dependency undici to v5.26.3 (#346)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [undici](https://undici.nodejs.org) ([source](https://togithub.com/nodejs/undici)) | [`5.26.0` -> `5.26.3`](https://renovatebot.com/diffs/npm/undici/5.26.0/5.26.3) | [![age](https://developer.mend.io/api/mc/badges/age/npm/undici/5.26.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/undici/5.26.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/undici/5.26.0/5.26.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/undici/5.26.0/5.26.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>nodejs/undici (undici)</summary>

### [`v5.26.3`](https://togithub.com/nodejs/undici/compare/v5.26.2...v5.26.3)

[Compare Source](https://togithub.com/nodejs/undici/compare/v5.26.2...v5.26.3)

### [`v5.26.2`](https://togithub.com/nodejs/undici/releases/tag/v5.26.2)

[Compare Source](https://togithub.com/nodejs/undici/compare/v5.26.1...v5.26.2)

Security Release, CVE to come soon.

### [`v5.26.1`](https://togithub.com/nodejs/undici/releases/tag/v5.26.1)

[Compare Source](https://togithub.com/nodejs/undici/compare/v5.26.0...v5.26.1)

#### What's Changed

-   Fix publish undici-types once and for all! by [@&#8203;Ethan-Arrowood](https://togithub.com/Ethan-Arrowood) in [https://github.com/nodejs/undici/pull/2338](https://togithub.com/nodejs/undici/pull/2338)
-   Fix node detection omfg by [@&#8203;KhafraDev](https://togithub.com/KhafraDev) in [https://github.com/nodejs/undici/pull/2341](https://togithub.com/nodejs/undici/pull/2341)

**Full Changelog**: nodejs/undici@v5.26.0...v5.26.1

</details>

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packages/next/package.json

@@ -303,7 +303,7 @@
     "timers-browserify": "2.0.12",
     "tty-browserify": "0.0.1",
     "ua-parser-js": "0.8.1",
-    "undici": "5.26.0",
+    "undici": "5.26.3",
     "unistore": "3.5.2",
     "util": "0.12.5",
     "uuid": "8.3.2",