Bump actionshub/markdownlint from 2.0.2 to 2.1.2

Bumps [actionshub/markdownlint](https://github.com/actionshub/markdownlint) from 2.0.2 to 2.1.2.
- [Release notes](https://github.com/actionshub/markdownlint/releases)
- [Commits](https://github.com/actionshub/markdownlint/compare/2.0.2...v2.1.2)

---
updated-dependencies:
- dependency-name: actionshub/markdownlint
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/addon-ci.yaml

@@ -90,7 +90,7 @@ jobs:
       - name: ⤵️ Check out code from GitHub
         uses: actions/checkout@v3.1.0
       - name: 🚀 Run mdl
-        uses: actionshub/markdownlint@2.0.2
+        uses: actionshub/markdownlint@v2.1.2
 
   lint-shellcheck:
     name: Shellcheck