Bump next from 14.2.15 to 15.0.3

Bumps [next](https://github.com/vercel/next.js) from 14.2.15 to 15.0.3.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v14.2.15...v15.0.3)

---
updated-dependencies:
- dependency-name: next
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -47,7 +47,7 @@
     "js-cookie": "^3.0.5",
     "jsonwebtoken": "^9.0.2",
     "lucide-react": "^0.454.0",
-    "next": "14.2.15",
+    "next": "15.0.3",
     "next-intl": "^3.20.0",
     "next-mdx-remote": "^5.0.0",
     "polkadot-api": "^1.6.5",