Update dependency conf to v15 (#2069)

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This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [conf](https://redirect.github.com/sindresorhus/conf) | [`14.0.0` -> `15.0.0`](https://renovatebot.com/diffs/npm/conf/14.0.0/15.0.0) | [![age](https://developer.mend.io/api/mc/badges/age/npm/conf/15.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/conf/14.0.0/15.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

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### Release Notes

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

### [`v15.0.0`](https://redirect.github.com/sindresorhus/conf/releases/tag/v15.0.0)

[Compare Source](https://redirect.github.com/sindresorhus/conf/compare/v14.0.0...v15.0.0)

There are no known breaking changes, but it's a major release since it contains a large refactor, and that introduces risk.

- Add [`.appendToArray()`](https://redirect.github.com/sindresorhus/conf?tab=readme-ov-file#appendtoarraykey-value) method  [`a1dbf86`](https://redirect.github.com/sindresorhus/conf/commit/a1dbf86)
- Fix constructor validation preventing migrations from fixing invalid schema data  [`a1b43e6`](https://redirect.github.com/sindresorhus/conf/commit/a1b43e6)
- Fix `clear()` method to emit single change event  [`9b83a9d`](https://redirect.github.com/sindresorhus/conf/commit/9b83a9d)
- Fix store setter to preserve internal migration data  [`ceefe13`](https://redirect.github.com/sindresorhus/conf/commit/ceefe13)

***

</details>

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Author: renovate[bot]

packages/create-next-app/package.json

@@ -43,7 +43,7 @@
     "chalk": "5.6.2",
     "ci-info": "watson/ci-info#688b9c25d246ee129ddd49f8e83449031f886ab6",
     "commander": "14.0.1",
-    "conf": "14.0.0",
+    "conf": "15.0.0",
     "cpy": "12.0.1",
     "cross-spawn": "7.0.6",
     "glob": "11.0.3",

packages/next/package.json

@@ -193,7 +193,7 @@
     "client-only": "0.0.1",
     "comment-json": "4.2.5",
     "compression": "1.8.1",
-    "conf": "14.0.0",
+    "conf": "15.0.0",
     "constants-browserify": "1.0.0",
     "content-disposition": "0.5.4",
     "content-type": "1.0.5",