build(deps): bump reftools from 1.1.8 to 1.1.9

Bumps [reftools](https://github.com/Mermade/oas-kit) from 1.1.8 to 1.1.9.
- [Release notes](https://github.com/Mermade/oas-kit/releases)
- [Changelog](https://github.com/Mermade/oas-kit/blob/main/CHANGELOG.md)
- [Commits](https://github.com/Mermade/oas-kit/compare/[email protected]@1.1.9)

---
updated-dependencies:
- dependency-name: reftools
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]