fix: bump next and payload to newer versions to resolve digital avatar dependabot alerts (#769)

* build(deps): bump next in /usecases/ai/digital-avatar/frontend

Bumps [next](https://github.com/vercel/next.js) from 15.2.4 to 15.5.2.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.2.4...v15.5.2)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.5.2
  dependency-type: direct:production
...

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

* fix: update payload version to resolve dependabot alerts

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Tiffany Pragasam <[email protected]>
Co-authored-by: Tiffany Pragasam <[email protected]>

Author: 2 people