build(deps): bump DavidAnson/markdownlint-cli2-action

Bumps [DavidAnson/markdownlint-cli2-action](https://github.com/DavidAnson/markdownlint-cli2-action) from 8.0.0 to 9.0.0.
- [Release notes](https://github.com/DavidAnson/markdownlint-cli2-action/releases)
- [Commits](DavidAnson/markdownlint-cli2-action@d57f8bd...5b7c9f7)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/markdown.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c
-      - uses: DavidAnson/markdownlint-cli2-action@d57f8bd57670b9c1deedf71219dd494614ff3335
+      - uses: DavidAnson/markdownlint-cli2-action@5b7c9f74fec47e6b15667b2cc23c63dff11e449e
         with:
           globs: |
             **/*.md