Bump orjson from 3.8.11 to 3.9.15 (#12)

Bumps [orjson](https://github.com/ijl/orjson) from 3.8.11 to 3.9.15.
- [Release notes](https://github.com/ijl/orjson/releases)
- [Changelog](https://github.com/ijl/orjson/blob/master/CHANGELOG.md)
- [Commits](ijl/orjson@3.8.11...3.9.15)

---
updated-dependencies:
- dependency-name: orjson
  dependency-type: indirect
...

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