chore: Bump markdownlint-cli2 from 0.20.0 to 0.21.0 in the all-dependencies group (#188)

chore: Bump markdownlint-cli2 in the all-dependencies group

Bumps the all-dependencies group with 1 update: [markdownlint-cli2](https://github.com/DavidAnson/markdownlint-cli2).


Updates `markdownlint-cli2` from 0.20.0 to 0.21.0
- [Changelog](https://github.com/DavidAnson/markdownlint-cli2/blob/main/CHANGELOG.md)
- [Commits](DavidAnson/markdownlint-cli2@v0.20.0...v0.21.0)

---
updated-dependencies:
- dependency-name: markdownlint-cli2
  dependency-version: 0.21.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: all-dependencies
...

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Author: dependabot[bot]

package-lock.json

@@ -26,7 +26,7 @@
     "eslint-plugin-github": "^6.0.0",
     "jest": "^30.0.3",
     "markdownlint": "^0.40.0",
-    "markdownlint-cli2": "^0.20.0"
+    "markdownlint-cli2": "^0.21.0"
   },
   "repository": {
     "type": "git",