Bump DavidAnson/markdownlint-cli2-action from 18.0.0 to 19.0.0 (open-telemetry#6044)

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

Author: dependabot[bot]

.github/workflows/markdownlint.yml

@@ -14,7 +14,7 @@ jobs:
       uses: actions/checkout@v4
 
     - name: run markdownlint
-      uses: DavidAnson/markdownlint-cli2-action@v18.0.0
+      uses: DavidAnson/markdownlint-cli2-action@v19.0.0
       with:
         globs: |
           **/*.md