Merge branch 'dependabot/github_actions/DavidAnson/markdownlint-cli2-action-19' (PR #6872)

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

Author: rljacob

.github/workflows/e3sm-gh-md-linter.yml

@@ -25,7 +25,7 @@ jobs:
       with:
         files: '**/*.md'
         separator: ","
-    - uses: DavidAnson/markdownlint-cli2-action@v18
+    - uses: DavidAnson/markdownlint-cli2-action@v19
       if: steps.changed-files.outputs.any_changed == 'true'
       with:
         config: 'docs/.markdownlint.json'