Bump saloonphp/saloon from 3.8.1 to 3.9.0

Bumps [saloonphp/saloon](https://github.com/saloonphp/saloon) from 3.8.1 to 3.9.0.
- [Release notes](https://github.com/saloonphp/saloon/releases)
- [Commits](saloonphp/saloon@v3.8.1...v3.9.0)

---
updated-dependencies:
- dependency-name: saloonphp/saloon
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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