Bump markdown from 5.0.0 to 6.0.0 (#3121)
Bump markdown from 5.0.0 to 6.0.0 (#3121)

Bumps [markdown](https://github.com/dart-lang/markdown) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/dart-lang/markdown/releases)
- [Changelog](https://github.com/dart-lang/markdown/blob/master/CHANGELOG.md)
- [Commits](https://github.com/dart-lang/markdown/compare/5.0.0...6.0.0)

---
updated-dependencies:
- dependency-name: markdown
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
keertip/dartdoc,keertip/dartdoc,dart-lang/dartdoc,keertip/dartdoc,dart-lang/dartdoc,dart-lang/dartdoc,dart-lang/dartdoc,keertip/dartdoc