Update dependency undici to v6.18.1 (#1029)

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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)) | [`6.16.1` -> `6.18.1`](https://renovatebot.com/diffs/npm/undici/6.16.1/6.18.1) | [![age](https://developer.mend.io/api/mc/badges/age/npm/undici/6.18.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/undici/6.18.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/undici/6.16.1/6.18.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/undici/6.16.1/6.18.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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---

### Release Notes

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

### [`v6.18.1`](https://togithub.com/nodejs/undici/releases/tag/v6.18.1)

[Compare Source](https://togithub.com/nodejs/undici/compare/v6.18.0...v6.18.1)

#### What's Changed

-   docs: Update references to dispatcher in docs by [@&#8203;haikyuu](https://togithub.com/haikyuu) in [nodejs/undici#3281
-   fix: compatibility for global headers by [@&#8203;tsctx](https://togithub.com/tsctx) in [nodejs/undici#3286
-   websocket: pre-calculated length by [@&#8203;tsctx](https://togithub.com/tsctx) in [nodejs/undici#3284
-   ci: fix autobahn workflow by [@&#8203;Uzlopak](https://togithub.com/Uzlopak) in [nodejs/undici#3291
-   revert: "websocket: pre-calculated length" by [@&#8203;KhafraDev](https://togithub.com/KhafraDev) in [nodejs/undici#3290
-   websocket: use FixedQueue instead of Set by [@&#8203;tsctx](https://togithub.com/tsctx) in [nodejs/undici#3283

#### New Contributors

-   [@&#8203;haikyuu](https://togithub.com/haikyuu) made their first contribution in [nodejs/undici#3281

**Full Changelog**: nodejs/undici@v6.18.0...v6.18.1

### [`v6.18.0`](https://togithub.com/nodejs/undici/releases/tag/v6.18.0)

[Compare Source](https://togithub.com/nodejs/undici/compare/v6.17.0...v6.18.0)

#### What's Changed

-   permessage-deflate decompression support in websocket by [@&#8203;KhafraDev](https://togithub.com/KhafraDev) in [nodejs/undici#3263
-   fix: Fix server closing in tests. by [@&#8203;ShogunPanda](https://togithub.com/ShogunPanda) in [nodejs/undici#3279

**Full Changelog**: nodejs/undici@v6.17.0...v6.18.0

### [`v6.17.0`](https://togithub.com/nodejs/undici/releases/tag/v6.17.0)

[Compare Source](https://togithub.com/nodejs/undici/compare/v6.16.1...v6.17.0)

#### What's Changed

-   fetch: fix captureStackTrace by [@&#8203;Uzlopak](https://togithub.com/Uzlopak) in [nodejs/undici#3227
-   fetch: fix wpt test request-upload.any.js by [@&#8203;Uzlopak](https://togithub.com/Uzlopak) in [nodejs/undici#3234
-   websocket: don't clone buffer by [@&#8203;tsctx](https://togithub.com/tsctx) in [nodejs/undici#3240
-   Remove unecessary async from writeBuffer by [@&#8203;DarkGL](https://togithub.com/DarkGL) in [nodejs/undici#3245
-   refactor websocket control frame handling by [@&#8203;KhafraDev](https://togithub.com/KhafraDev) in [nodejs/undici#3241
-   fix parsing continuation frames in websocket by [@&#8203;KhafraDev](https://togithub.com/KhafraDev) in [nodejs/undici#3247
-   ci: node nightly test should use node 23 by [@&#8203;Uzlopak](https://togithub.com/Uzlopak) in [nodejs/undici#3248
-   Add test to verify if the connection is correctly aborted on cancel by [@&#8203;mcollina](https://togithub.com/mcollina) in [nodejs/undici#3219
-   Autobahn suite by [@&#8203;KhafraDev](https://togithub.com/KhafraDev) in [nodejs/undici#3251
-   websocket: fix 6 autobahn tests by [@&#8203;KhafraDev](https://togithub.com/KhafraDev) in [nodejs/undici#3254
-   websocket: checkout correct commit in autobahn workflow by [@&#8203;Uzlopak](https://togithub.com/Uzlopak) in [nodejs/undici#3258
-   Cleanup websocket by [@&#8203;KhafraDev](https://togithub.com/KhafraDev) in [nodejs/undici#3257
-   websocket: autobahn workflow should fail on error by [@&#8203;Uzlopak](https://togithub.com/Uzlopak) in [nodejs/undici#3259
-   add bodymixin bytes by [@&#8203;KhafraDev](https://togithub.com/KhafraDev) in [nodejs/undici#3262
-   perf: avoid buffer cloning by [@&#8203;tsctx](https://togithub.com/tsctx) in [nodejs/undici#3264
-   feat: dump interceptor by [@&#8203;metcoder95](https://togithub.com/metcoder95) in [nodejs/undici#3118
-   use private properties in Headers by [@&#8203;KhafraDev](https://togithub.com/KhafraDev) in [nodejs/undici#3269
-   Revert "websocket: autobahn workflow should fail on error" by [@&#8203;Uzlopak](https://togithub.com/Uzlopak) in [nodejs/undici#3270
-   build(deps): bump node from `487dc5d` to `9e8f45f` in /build by [@&#8203;dependabot](https://togithub.com/dependabot) in [nodejs/undici#3271

#### New Contributors

-   [@&#8203;DarkGL](https://togithub.com/DarkGL) made their first contribution in [nodejs/undici#3245

**Full Changelog**: nodejs/undici@v6.16.1...v6.17.0

</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": "6.16.1",
+    "undici": "6.18.1",
     "unistore": "3.5.2",
     "util": "0.12.5",
     "uuid": "9.0.1",