Bump DavidAnson/markdownlint-cli2-action from 18 to 19

Bumps [DavidAnson/markdownlint-cli2-action](https://github.com/davidanson/markdownlint-cli2-action) from 18 to 19.
- [Release notes](https://github.com/davidanson/markdownlint-cli2-action/releases)
- [Commits](https://github.com/davidanson/markdownlint-cli2-action/compare/v18...v19)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yml

@@ -39,7 +39,7 @@ jobs:
     - name: Check out code into the Go module directory
       uses: actions/checkout@v4
     - name: markdownlint-cli2-action
-      uses: DavidAnson/markdownlint-cli2-action@v18
+      uses: DavidAnson/markdownlint-cli2-action@v19
 
   # Executes Unit Tests
   ci-unit-tests: