Upgrade: Bump markdownlint-cli from 0.28.1 to 0.31.1

Bumps [markdownlint-cli](https://github.com/igorshubovych/markdownlint-cli) from 0.28.1 to 0.31.1.
- [Release notes](https://github.com/igorshubovych/markdownlint-cli/releases)
- [Commits](igorshubovych/markdownlint-cli@v0.28.1...v0.31.1)

---
updated-dependencies:
- dependency-name: markdownlint-cli
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Close: #993

Author: dependabot[bot]

package-lock.json

@@ -53,7 +53,7 @@
     "hexo-server": "^3.0.0",
     "hexo-util": "^2.6.0",
     "json2yaml": "^1.1.0",
-    "markdownlint-cli": "^0.28.1",
+    "markdownlint-cli": "^0.31.1",
     "marked": "^2.0.0",
     "md-2-json": "^2.0.0",
     "mkdirp": "^1.0.2",