Update dependency undici to v5.26.0 (#341)

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

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/) |

---

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

#### New Contributors

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

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

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://developer.mend.io/github/X-oss-byte/Nextjs).

packages/next/package.json

@@ -303,7 +303,7 @@
     "timers-browserify": "2.0.12",
     "tty-browserify": "0.0.1",
     "ua-parser-js": "0.8.1",
-    "undici": "5.25.4",
+    "undici": "5.26.0",
     "unistore": "3.5.2",
     "util": "0.12.5",
     "uuid": "8.3.2",