Bump ujson from 5.8.0 to 5.9.0 in /api

Bumps [ujson](https://github.com/ultrajson/ultrajson) from 5.8.0 to 5.9.0.
- [Release notes](https://github.com/ultrajson/ultrajson/releases)
- [Commits](ultrajson/ultrajson@5.8.0...5.9.0)

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

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