Update dependency undici to v5.26.0 (#340)

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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)) | [`5.25.4` -> `5.26.0`](https://renovatebot.com/diffs/npm/undici/5.25.4/5.26.0) | [![age](https://developer.mend.io/api/mc/badges/age/npm/undici/5.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/undici/5.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/undici/5.25.4/5.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/undici/5.25.4/5.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### ⚠ Dependency Lookup Warnings ⚠

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### Release Notes

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

### [`v5.26.0`](https://togithub.com/nodejs/undici/releases/tag/v5.26.0)

[Compare Source](https://togithub.com/nodejs/undici/compare/5e654f351a9a813fed3e9feff4388b5c4fbda787...v5.26.0)

#### What's Changed

-   use npm install instead of npm ci by [@&#8203;Ethan-Arrowood](https://togithub.com/Ethan-Arrowood) in [nodejs/undici#2309
-   change default header to `node` by [@&#8203;Ethan-Arrowood](https://togithub.com/Ethan-Arrowood) in [nodejs/undici#2310
-   chore: change order of the pseudo-headers by [@&#8203;kyrylodolynskyi](https://togithub.com/kyrylodolynskyi) in [nodejs/undici#2308
-   fix: Agent.Options.factory should accept URL object or string as parameter by [@&#8203;nicole0707](https://togithub.com/nicole0707) in [nodejs/undici#2295
-   build(deps-dev): bump sinon from 15.2.0 to 16.1.0 by [@&#8203;dependabot](https://togithub.com/dependabot) in [nodejs/undici#2312
-   test: handle npm ignore-scripts settings by [@&#8203;panva](https://togithub.com/panva) in [nodejs/undici#2313
-   feat: respect `--max-http-header-size` Node.js flag by [@&#8203;balazsorban44](https://togithub.com/balazsorban44) in [nodejs/undici#2234
-   fix([#&#8203;2311](https://togithub.com/nodejs/undici/issues/2311)): End stream after body sent by [@&#8203;metcoder95](https://togithub.com/metcoder95) in [nodejs/undici#2314
-   disallow setting host header in fetch by [@&#8203;KhafraDev](https://togithub.com/KhafraDev) in [nodejs/undici#2322
-   \[StepSecurity] ci: Harden GitHub Actions by [@&#8203;step-security-bot](https://togithub.com/step-security-bot) in [nodejs/undici#2325
-   fix fetch with coverage enabled by [@&#8203;KhafraDev](https://togithub.com/KhafraDev) in [nodejs/undici#2330
-   Fix stuck when using http2 POST Buffer by [@&#8203;binsee](https://togithub.com/binsee) in [nodejs/undici#2336
-   fix: 🏷️ add allowH2 to BuildOptions by [@&#8203;binsee](https://togithub.com/binsee) in [nodejs/undici#2334
-   fix: 🐛 fix process http2 header by [@&#8203;binsee](https://togithub.com/binsee) in [nodejs/undici#2332

#### New Contributors

-   [@&#8203;kyrylodolynskyi](https://togithub.com/kyrylodolynskyi) made their first contribution in [nodejs/undici#2308
-   [@&#8203;nicole0707](https://togithub.com/nicole0707) made their first contribution in [nodejs/undici#2295
-   [@&#8203;balazsorban44](https://togithub.com/balazsorban44) made their first contribution in [nodejs/undici#2234
-   [@&#8203;binsee](https://togithub.com/binsee) made their first contribution in [nodejs/undici#2336

**Full Changelog**: nodejs/undici@v5.23.4...v5.26.0

</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": "1.0.36",
-    "undici": "5.25.4",
+    "undici": "5.26.0",
     "unistore": "3.5.2",
     "util": "0.12.5",
     "uuid": "9.0.1",