Bump DavidAnson/markdownlint-cli2-action from 18.0.0 to 19.0.0 (#14132)

Bumps [DavidAnson/markdownlint-cli2-action](https://github.com/davidanson/markdownlint-cli2-action) from 18.0.0 to 19.0.0.
- [Release notes](https://github.com/davidanson/markdownlint-cli2-action/releases)
- [Commits](DavidAnson/markdownlint-cli2-action@v18.0.0...v19.0.0)

---
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>

Author: dependabot[bot]

.github/workflows/ci-markdown.yml

@@ -27,7 +27,7 @@ jobs:
           fetch-depth: 10
 
       - name: Run markdownlint
-        uses: DavidAnson/markdownlint-cli2-action@v18.0.0
+        uses: DavidAnson/markdownlint-cli2-action@v19.0.0
         with:
           globs: |
             lib/elixir/pages/**/*.md