Bump mdit-py-plugins from 0.4.1 to 0.4.2

Bumps [mdit-py-plugins](https://github.com/executablebooks/mdit-py-plugins) from 0.4.1 to 0.4.2.
- [Release notes](https://github.com/executablebooks/mdit-py-plugins/releases)
- [Changelog](https://github.com/executablebooks/mdit-py-plugins/blob/master/CHANGELOG.md)
- [Commits](executablebooks/mdit-py-plugins@v0.4.1...v0.4.2)

---
updated-dependencies:
- dependency-name: mdit-py-plugins
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]