Update dependency undici to v6 (#571)

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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)) | [`5.28.2` -> `6.0.0`](https://renovatebot.com/diffs/npm/undici/5.28.2/6.0.0) | [![age](https://developer.mend.io/api/mc/badges/age/npm/undici/6.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/undici/6.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/undici/5.28.2/6.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/undici/5.28.2/6.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

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### Release Notes

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

### [`v6.0.0`](https://togithub.com/nodejs/undici/releases/tag/v6.0.0)

[Compare Source](https://togithub.com/nodejs/undici/compare/v5.28.2...v6.0.0)

#### What's Changed

-   16 eol by [@&#8203;ronag](https://togithub.com/ronag) in [nodejs/undici#2480
-   update spec & wpts by [@&#8203;KhafraDev](https://togithub.com/KhafraDev) in [nodejs/undici#2482
-   version cleanup by [@&#8203;KhafraDev](https://togithub.com/KhafraDev) in [nodejs/undici#2483
-   perf: avoid Response initialization by [@&#8203;tsctx](https://togithub.com/tsctx) in [nodejs/undici#2489
-   perf: optimize `parseHeaders` by [@&#8203;tsctx](https://togithub.com/tsctx) in [nodejs/undici#2492
-   chore: fix typo by [@&#8203;tsctx](https://togithub.com/tsctx) in [nodejs/undici#2490
-   feat: print attempted addresses on ConnectTimeoutError by [@&#8203;fengmk2](https://togithub.com/fengmk2) in [nodejs/undici#2494
-   Expose HTTP errors that are not meant to be retried by [@&#8203;MzUgM](https://togithub.com/MzUgM) in [nodejs/undici#2496

**Full Changelog**: nodejs/undici@v5.28.2...v6.0.0

</details>

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packages/next/package.json

@@ -279,7 +279,7 @@
     "timers-browserify": "2.0.12",
     "tty-browserify": "0.0.1",
     "ua-parser-js": "1.0.37",
-    "undici": "5.28.2",
+    "undici": "6.0.0",
     "unistore": "3.5.2",
     "util": "0.12.5",
     "uuid": "9.0.1",