Bump markdown-it and ndoc

Bumps [markdown-it](https://github.com/markdown-it/markdown-it) to 14.2.0 and updates ancestor dependency [ndoc](https://github.com/nodeca/ndoc). These dependencies need to be updated together.


Updates `markdown-it` from 12.3.2 to 14.2.0
- [Changelog](https://github.com/markdown-it/markdown-it/blob/master/CHANGELOG.md)
- [Commits](markdown-it/markdown-it@12.3.2...14.2.0)

Updates `ndoc` from 6.0.0 to 6.0.1
- [Changelog](https://github.com/nodeca/ndoc/blob/master/CHANGELOG.md)
- [Commits](nodeca/ndoc@6.0.0...6.0.1)

---
updated-dependencies:
- dependency-name: markdown-it
  dependency-version: 14.2.0
  dependency-type: indirect
- dependency-name: ndoc
  dependency-version: 6.0.1
  dependency-type: direct:development
...

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

Author: dependabot[bot]