chore(deps): bump next from 14.2.15 to 14.2.21 (supabase#32559)

* chore(deps): bump next from 14.2.15 to 15.1.3

Bumps [next](https://github.com/vercel/next.js) from 14.2.15 to 15.1.3.
- [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...v15.1.3)

---
updated-dependencies:
- dependency-name: next
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

* Bump next to 14.2.21.

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Ivan Vasilov <vasilov.ivan@gmail.com>

Author: dependabot[bot]