Bump zod from 3.23.8 to 3.24.1 in /backend

Bumps [zod](https://github.com/colinhacks/zod) from 3.23.8 to 3.24.1.
- [Release notes](https://github.com/colinhacks/zod/releases)
- [Changelog](https://github.com/colinhacks/zod/blob/main/CHANGELOG.md)
- [Commits](colinhacks/zod@v3.23.8...v3.24.1)

---
updated-dependencies:
- dependency-name: zod
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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