Bump DavidAnson/markdownlint-cli2-action from 16.0.0 to 18.0.0

Bumps [DavidAnson/markdownlint-cli2-action](https://github.com/davidanson/markdownlint-cli2-action) from 16.0.0 to 18.0.0.
- [Release notes](https://github.com/davidanson/markdownlint-cli2-action/releases)
- [Commits](DavidAnson/markdownlint-cli2-action@v16.0.0...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]>

Author: dependabot[bot]

.github/workflows/markdownlint.yml

@@ -14,7 +14,7 @@ jobs:
       uses: actions/checkout@v4
 
     - name: run markdownlint
-      uses: DavidAnson/markdownlint-cli2-action@v16.0.0
+      uses: DavidAnson/markdownlint-cli2-action@v18.0.0
       with:
         globs: |
           **/*.md