Bump yaml and markdownlint-cli2

Bumps [yaml](https://github.com/eemeli/yaml) to 2.3.1 and updates ancestor dependency [markdownlint-cli2](https://github.com/DavidAnson/markdownlint-cli2). These dependencies need to be updated together.


Updates `yaml` from 2.2.1 to 2.3.1
- [Release notes](https://github.com/eemeli/yaml/releases)
- [Commits](eemeli/yaml@v2.2.1...v2.3.1)

Updates `markdownlint-cli2` from 0.6.0 to 0.8.1
- [Changelog](https://github.com/DavidAnson/markdownlint-cli2/blob/main/CHANGELOG.md)
- [Commits](DavidAnson/markdownlint-cli2@v0.6.0...v0.8.1)

---
updated-dependencies:
- dependency-name: yaml
  dependency-type: indirect
- dependency-name: markdownlint-cli2
  dependency-type: direct:production
...

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

package.json

@@ -20,6 +20,6 @@
   },
   "homepage": "https://github.com/TritonDataCenter/smartos-docs#readme",
   "dependencies": {
-    "markdownlint-cli2": "^0.6.0"
+    "markdownlint-cli2": "^0.8.1"
   }
 }