Bump markdown-it and @atlaskit/editor-markdown-transformer in /valispace

Bumps [markdown-it](https://github.com/markdown-it/markdown-it) to 12.3.2 and updates ancestor dependency [@atlaskit/editor-markdown-transformer](https://bitbucket.org/atlassian/atlassian-frontend). These dependencies need to be updated together.


Updates `markdown-it` from 10.0.0 to 12.3.2
- [Release notes](https://github.com/markdown-it/markdown-it/releases)
- [Changelog](https://github.com/markdown-it/markdown-it/blob/master/CHANGELOG.md)
- [Commits](markdown-it/markdown-it@10.0.0...12.3.2)

Updates `@atlaskit/editor-markdown-transformer` from 4.2.7 to 4.2.17
- [Commits](https://bitbucket.org/atlassian/atlassian-frontend/commits)

---
updated-dependencies:
- dependency-name: markdown-it
  dependency-type: indirect
- dependency-name: "@atlaskit/editor-markdown-transformer"
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]