Bump avto-dev/markdown-lint from v1.3.1 to v1.4.0

Bumps [avto-dev/markdown-lint](https://github.com/avto-dev/markdown-lint) from v1.3.1 to v1.4.0.
- [Release notes](https://github.com/avto-dev/markdown-lint/releases)
- [Changelog](https://github.com/avto-dev/markdown-lint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/avto-dev/markdown-lint/compare/v1.3.1...6e6d4393411fbaae3c3aeee5661ba84a0352ed3b)

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

.github/workflows/lint.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2.3.2
-    - uses: avto-dev/markdown-lint@v1.3.1
+    - uses: avto-dev/markdown-lint@v1.4.0
       with:
         config: '.github/markdown-lint.yaml'
         args: './**/*.md'