Update dependency conf to v12 (#538)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [conf](https://github.com/sindresorhus/conf) | [`11.0.2` -> `12.0.0`](https://renovatebot.com/diffs/npm/conf/11.0.2/12.0.0) | [![age](https://developer.mend.io/api/mc/badges/age/npm/conf/12.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/conf/12.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/conf/11.0.2/12.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/conf/11.0.2/12.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>sindresorhus/conf (conf)</summary>

### [`v12.0.0`](https://github.com/sindresorhus/conf/releases/tag/v12.0.0)

[Compare Source](https://github.com/sindresorhus/conf/compare/v11.0.2...v12.0.0)

##### Breaking

-   Require Node.js 18  [`aa12658`](https://github.com/sindresorhus/conf/commit/aa12658)

</details>

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packages/create-next-app/package.json

@@ -40,7 +40,7 @@
     "async-retry": "1.3.3",
     "ci-info": "watson/ci-info#54e74d014ebed90aa5684c9812d8e14f49c194b0",
     "commander": "11.1.0",
-    "conf": "11.0.2",
+    "conf": "12.0.0",
     "cross-spawn": "7.0.3",
     "fast-glob": "3.3.1",
     "got": "13.0.0",

packages/next/package.json

@@ -212,7 +212,7 @@
     "client-only": "0.0.1",
     "comment-json": "4.2.3",
     "compression": "1.7.4",
-    "conf": "11.0.2",
+    "conf": "12.0.0",
     "constants-browserify": "1.0.0",
     "content-disposition": "0.5.4",
     "content-type": "1.0.5",