Bump markdown-it-anchor from 6.0.0 to 6.0.1

Bumps [markdown-it-anchor](https://github.com/valeriangalliat/markdown-it-anchor) from 6.0.0 to 6.0.1.
- [Release notes](https://github.com/valeriangalliat/markdown-it-anchor/releases)
- [Changelog](https://github.com/valeriangalliat/markdown-it-anchor/blob/master/CHANGELOG.md)
- [Commits](https://github.com/valeriangalliat/markdown-it-anchor/commits

)

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