fix(deps): update dependency next to v16.0.3 (#1524)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [next](https://nextjs.org)
([source](https://redirect.github.com/vercel/next.js)) | [`16.0.1` ->
`16.0.3`](https://renovatebot.com/diffs/npm/next/16.0.1/16.0.3) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/next/16.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/next/16.0.1/16.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>vercel/next.js (next)</summary>

###
[`v16.0.3`](https://redirect.github.com/vercel/next.js/compare/v16.0.2...v16.0.3)

[Compare
Source](https://redirect.github.com/vercel/next.js/compare/v16.0.2...v16.0.3)

###
[`v16.0.2`](https://redirect.github.com/vercel/next.js/compare/v16.0.1...01014d476c0691295e1963940e78ed0faab50e68)

[Compare
Source](https://redirect.github.com/vercel/next.js/compare/v16.0.1...v16.0.2)

</details>

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form-demo/package.json

@@ -11,7 +11,7 @@
   },
   "dependencies": {
     "@obosbbl/grunnmuren-react": "workspace:*",
-    "next": "16.0.1",
+    "next": "16.0.3",
     "zod": "4.1.12"
   },
   "devDependencies": {