Bump kramdown from 2.3.2 to 2.4.0 in /gemfiles/rails_61 (#7466)
Bump kramdown from 2.3.2 to 2.4.0 in /gemfiles/rails_61 (#7466)

Bumps [kramdown](https://github.com/gettalong/kramdown) from 2.3.2 to 2.4.0.
- [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)

---
updated-dependencies:
- dependency-name: kramdown
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
activeadmin/activeadmin,activeadmin/activeadmin,activeadmin/activeadmin