Bump typedoc and typedoc-plugin-markdown

Bumps [typedoc](https://github.com/TypeStrong/TypeDoc) and [typedoc-plugin-markdown](https://github.com/typedoc2md/typedoc-plugin-markdown/tree/HEAD/packages/typedoc-plugin-markdown). These dependencies needed to be updated together.

Updates `typedoc` from 0.25.13 to 0.28.16
- [Release notes](https://github.com/TypeStrong/TypeDoc/releases)
- [Changelog](https://github.com/TypeStrong/typedoc/blob/master/CHANGELOG.md)
- [Commits](TypeStrong/typedoc@v0.25.13...v0.28.16)

Updates `typedoc-plugin-markdown` from 4.0.3 to 4.9.0
- [Release notes](https://github.com/typedoc2md/typedoc-plugin-markdown/releases)
- [Changelog](https://github.com/typedoc2md/typedoc-plugin-markdown/blob/main/packages/typedoc-plugin-markdown/CHANGELOG.md)
- [Commits](https://github.com/typedoc2md/typedoc-plugin-markdown/commits/typedoc-plugin-markdown@4.9.0/packages/typedoc-plugin-markdown)

---
updated-dependencies:
- dependency-name: typedoc
  dependency-version: 0.28.16
  dependency-type: direct:development
  update-type: version-update:semver-minor
- dependency-name: typedoc-plugin-markdown
  dependency-version: 4.9.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]