chore(deps-dev): bump next from 14.0.4 to 15.0.3 in /website

Bumps [next](https://github.com/vercel/next.js) from 14.0.4 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@v14.0.4...v15.0.3)

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

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