Bump kramdown from 2.1.0 to 2.3.0 Bumps [kramdown](https://github.com/gettalong/kramdown) from 2.1.0 to 2.3.0. - [Release notes](https://github.com/gettalong/kramdown/releases) - [Changelog](https://github.com/gettalong/kramdown/blob/master/doc/news.page) - [Commits](https://github.com/gettalong/kramdown/commits) Signed-off-by: dependabot[bot]