npm - back-end: bump markdownlint-cli2 from 0.12.0 to 0.17.1

Bumps [markdownlint-cli2](https://github.com/DavidAnson/markdownlint-cli2) from 0.12.0 to 0.17.1.
- [Changelog](https://github.com/DavidAnson/markdownlint-cli2/blob/main/CHANGELOG.md)
- [Commits](DavidAnson/markdownlint-cli2@v0.12.0...v0.17.1)

---
updated-dependencies:
- dependency-name: markdownlint-cli2
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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