Bump markdownlint-cli2 from 0.4.0 to 0.5.1 (#16)

Bumps [markdownlint-cli2](https://github.com/DavidAnson/markdownlint-cli2) from 0.4.0 to 0.5.1.
- [Release notes](https://github.com/DavidAnson/markdownlint-cli2/releases)
- [Commits](DavidAnson/markdownlint-cli2@v0.4.0...v0.5.1)

---
updated-dependencies:
- dependency-name: markdownlint-cli2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -23,7 +23,7 @@
   },
   "dependencies": {
     "@actions/core": "1.9.1",
-    "markdownlint-cli2": "0.4.0"
+    "markdownlint-cli2": "0.5.1"
   },
   "devDependencies": {
     "@vercel/ncc": "0.34.0",