build(deps-dev): bump @microsoft/api-extractor from 7.15.2 to 7.18.4

Bumps [@microsoft/api-extractor](https://github.com/microsoft/rushstack) from 7.15.2 to 7.18.4.
- [Release notes](https://github.com/microsoft/rushstack/releases)
- [Commits](https://github.com/microsoft/rushstack/compare/@microsoft/api-extractor_v7.15.2...@microsoft/api-extractor_v7.18.4)

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

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