Bump markdownlint-cli2 to v0.17.1

What does this MR do and why?

This MR updates markdownlint2 from 0.14.0 to 0.17.1.

Full changelog https://github.com/DavidAnson/markdownlint-cli2/compare/v0.14.0...v0.17.1

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1. Configure a local GitLab Docs environment: https://gitlab.com/gitlab-org/gitlab-docs/-/blob/main/doc/setup.md.

Merge request acceptance checklist

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• I have evaluated the MR acceptance checklist for this merge request.