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