build(deps-dev): bump @microsoft/api-extractor from 7.18.5 to 7.18.9 (#30)

Bumps [@microsoft/api-extractor](https://github.com/microsoft/rushstack) from 7.18.5 to 7.18.9.
- [Release notes](https://github.com/microsoft/rushstack/releases)
- [Commits](https://github.com/microsoft/rushstack/compare/@microsoft/api-extractor_v7.18.5...@microsoft/api-extractor_v7.18.9)

---
updated-dependencies:
- dependency-name: "@microsoft/api-extractor"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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