Bump typedoc from 0.21.5 to 0.21.6

Bumps [typedoc](https://github.com/TypeStrong/TypeDoc) from 0.21.5 to 0.21.6.
- [Release notes](https://github.com/TypeStrong/TypeDoc/releases)
- [Commits](TypeStrong/typedoc@v0.21.5...v0.21.6)

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

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