⬆️ Bump DavidAnson/markdownlint-cli2-action from 19 to 20 (#558)

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
         uses: crate-ci/typos@master
 
       - name: markdownlint
-        uses: DavidAnson/markdownlint-cli2-action@v19
+        uses: DavidAnson/markdownlint-cli2-action@v20
         with:
           config: "docs/.markdownlint.yaml"
           globs: "**/*.md"