Bump markdown-it and ember-cli

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


Updates `markdown-it` from 8.4.2 to 14.2.0
- [Changelog](https://github.com/markdown-it/markdown-it/blob/master/CHANGELOG.md)
- [Commits](markdown-it/markdown-it@8.4.2...14.2.0)

Updates `ember-cli` from 3.12.1 to 7.0.1
- [Release notes](https://github.com/ember-cli/ember-cli/releases)
- [Changelog](https://github.com/ember-cli/ember-cli/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ember-cli/ember-cli/commits)

---
updated-dependencies:
- dependency-name: markdown-it
  dependency-version: 14.2.0
  dependency-type: indirect
- dependency-name: ember-cli
  dependency-version: 7.0.1
  dependency-type: direct:development
...

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

Author: dependabot[bot]