Update dependency undici to v5.26.5 (#507)

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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)) | [`5.26.4` -> `5.26.5`](https://renovatebot.com/diffs/npm/undici/5.26.4/5.26.5) | [![age](https://developer.mend.io/api/mc/badges/age/npm/undici/5.26.5?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/undici/5.26.5?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/undici/5.26.4/5.26.5?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/undici/5.26.4/5.26.5?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v5.26.5`](https://togithub.com/nodejs/undici/releases/tag/v5.26.5)

[Compare Source](https://togithub.com/nodejs/undici/compare/v5.26.4...v5.26.5)

#### What's Changed

-   Drop race condition in connect-timeout test by [@&#8203;mcollina](https://togithub.com/mcollina) in [https://github.com/nodejs/undici/pull/2360](https://togithub.com/nodejs/undici/pull/2360)
-   Remove a couple of unnecessary async functions by [@&#8203;kibertoad](https://togithub.com/kibertoad) in [https://github.com/nodejs/undici/pull/2367](https://togithub.com/nodejs/undici/pull/2367)
-   Update namespace type with Fetch exports by [@&#8203;Ethan-Arrowood](https://togithub.com/Ethan-Arrowood) in [https://github.com/nodejs/undici/pull/2361](https://togithub.com/nodejs/undici/pull/2361)

**Full Changelog**: nodejs/undici@v5.26.4...v5.26.5

</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": "1.0.36",
-    "undici": "5.26.4",
+    "undici": "5.26.5",
     "unistore": "3.5.2",
     "util": "0.12.5",
     "uuid": "9.0.1",