build(deps-dev): bump typedoc from 0.21.6 to 0.21.9 (#360)

Bumps [typedoc](https://github.com/TypeStrong/TypeDoc) from 0.21.6 to 0.21.9.
- [Release notes](https://github.com/TypeStrong/TypeDoc/releases)
- [Commits](TypeStrong/typedoc@v0.21.6...v0.21.9)

---
updated-dependencies:
- dependency-name: typedoc
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]