chore: bump @compodoc/compodoc from 1.1.19 to 1.1.21

Bumps [@compodoc/compodoc](https://github.com/compodoc/compodoc) from 1.1.19 to 1.1.21.
- [Release notes](https://github.com/compodoc/compodoc/releases)
- [Changelog](https://github.com/compodoc/compodoc/blob/develop/CHANGELOG.md)
- [Commits](compodoc/compodoc@1.1.19...1.1.21)

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

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

Author: dependabot[bot]