ci: bump `markdownlint-cli2-action` from 5.0.0 to 5.1.0 (#526)
ci: bump `markdownlint-cli2-action` from 5.0.0 to 5.1.0 (#526)

See:
- https://github.com/DavidAnson/markdownlint-cli2-action/releases/tag/v5.1.0
- https://github.com/DavidAnson/markdownlint-cli2-action/compare/b3c3b40b95c1...744f913a1240

Co-authored-by: ee7 <6cd0bf6d6fb42eedb0ac66182c815fd97fb4f715@users.noreply.github.com>

exercism/configlet