Bump DavidAnson/markdownlint-cli2-action from 16.0.0 to 18.0.0 (#26)

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

.github/workflows/actions.yml

@@ -8,4 +8,4 @@ jobs:
       - name: checkout
         uses: actions/checkout@v4
       - name: markdownlint-cli2-action
-        uses: DavidAnson/markdownlint-cli2-action@v16.0.0
+        uses: DavidAnson/markdownlint-cli2-action@v18.0.0