Update DavidAnson/markdownlint-cli2-action action to v19

Author: renovate[bot]

.github/workflows/lint.yml

@@ -33,7 +33,7 @@ jobs:
 
       # uses .markdownlint.yml for configuration
       - name: markdownlint
-        uses: DavidAnson/markdownlint-cli2-action@eb5ca3ab411449c66620fe7f1b3c9e10547144b0 # v18.0.0
+        uses: DavidAnson/markdownlint-cli2-action@a23dae216ce3fee4db69da41fed90d2a4af801cf # v19.0.0
         with:
           globs: |
             .github/**/*.md