Bump typedoc-plugin-markdown from 3.14.0 to 3.15.0

Bumps [typedoc-plugin-markdown](https://github.com/tgreyuk/typedoc-plugin-markdown/tree/HEAD/packages/typedoc-plugin-markdown) from 3.14.0 to 3.15.0.
- [Release notes](https://github.com/tgreyuk/typedoc-plugin-markdown/releases)
- [Changelog](https://github.com/tgreyuk/typedoc-plugin-markdown/blob/master/packages/typedoc-plugin-markdown/CHANGELOG.md)
- [Commits](https://github.com/tgreyuk/typedoc-plugin-markdown/commits/[email protected]/packages/typedoc-plugin-markdown)

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

Signed-off-by: dependabot[bot] <[email protected]>