Bump DavidAnson/markdownlint-cli2-action from 17.0.0 to 18.0.0 (#572)

Bumps [DavidAnson/markdownlint-cli2-action](https://github.com/davidanson/markdownlint-cli2-action) from 17.0.0 to 18.0.0.
- [Release notes](https://github.com/davidanson/markdownlint-cli2-action/releases)
- [Commits](DavidAnson/markdownlint-cli2-action@v17.0.0...v18.0.0)

---
updated-dependencies:
- dependency-name: DavidAnson/markdownlint-cli2-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/validate-documentation.yml

@@ -30,4 +30,4 @@ jobs:
       with:
         files: '**/*.md'
 
-    - uses: DavidAnson/markdownlint-cli2-action@v17.0.0
+    - uses: DavidAnson/markdownlint-cli2-action@v18.0.0