build(deps-dev): bump the docs group across 1 directory with 3 updates

Bumps the docs group with 3 updates in the / directory: [@antora/cli](https://gitlab.com/antora/antora), [@antora/site-generator-default](https://gitlab.com/antora/antora) and [typedoc](https://github.com/TypeStrong/TypeDoc).


Updates `@antora/cli` from 3.1.8 to 3.1.9
- [Changelog](https://gitlab.com/antora/antora/blob/main/CHANGELOG.adoc)
- [Commits](https://gitlab.com/antora/antora/compare/v3.1.8...v3.1.9)

Updates `@antora/site-generator-default` from 3.1.8 to 3.1.9
- [Changelog](https://gitlab.com/antora/antora/blob/main/CHANGELOG.adoc)
- [Commits](https://gitlab.com/antora/antora/compare/v3.1.8...v3.1.9)

Updates `typedoc` from 0.26.3 to 0.26.4
- [Release notes](https://github.com/TypeStrong/TypeDoc/releases)
- [Changelog](https://github.com/TypeStrong/typedoc/blob/master/CHANGELOG.md)
- [Commits](TypeStrong/typedoc@v0.26.3...v0.26.4)

---
updated-dependencies:
- dependency-name: "@antora/cli"
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: docs
- dependency-name: "@antora/site-generator-default"
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: docs
- dependency-name: typedoc
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: docs
...

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