Bump DavidAnson/markdownlint-cli2-action from 17 to 20 (#11)

Bumps [DavidAnson/markdownlint-cli2-action](https://github.com/davidanson/markdownlint-cli2-action) from 17 to 20.
- [Release notes](https://github.com/davidanson/markdownlint-cli2-action/releases)
- [Commits](DavidAnson/markdownlint-cli2-action@v17...v20)

---
updated-dependencies:
- dependency-name: DavidAnson/markdownlint-cli2-action
  dependency-version: '20'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/markdownLint.yaml

@@ -29,7 +29,7 @@ jobs:
       id: changed-files
       with:
         files: '**/*.md'
-    - uses: DavidAnson/markdownlint-cli2-action@v17
+    - uses: DavidAnson/markdownlint-cli2-action@v20
       if: steps.changed-files.outputs.any_changed == 'true'
       with:
         globs: ${{ steps.changed-files.outputs.all_changed_files }}