Update DavidAnson/markdownlint-cli2-action action to v16

Author: renovate[bot]

.github/workflows/lint.yml

@@ -15,7 +15,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Run markdownlint
-        uses: DavidAnson/markdownlint-cli2-action@v15
+        uses: DavidAnson/markdownlint-cli2-action@v16
         with:
           globs: |
             *.md