Bump markdownlint-cli2 from 0.11.0 to 0.12.1 in /extensions/ql-vscode (#3279)

Bumps [markdownlint-cli2](https://github.com/DavidAnson/markdownlint-cli2) from 0.11.0 to 0.12.1.
- [Changelog](https://github.com/DavidAnson/markdownlint-cli2/blob/main/CHANGELOG.md)
- [Commits](DavidAnson/markdownlint-cli2@v0.11.0...v0.12.1)

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

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

Author: dependabot[bot]

extensions/ql-vscode/package-lock.json

@@ -2043,7 +2043,7 @@
     "jest-environment-jsdom": "^29.0.3",
     "jest-runner-vscode": "^3.0.1",
     "lint-staged": "^15.0.2",
-    "markdownlint-cli2": "^0.11.0",
+    "markdownlint-cli2": "^0.12.1",
     "markdownlint-cli2-formatter-pretty": "^0.0.5",
     "mini-css-extract-plugin": "^2.6.1",
     "npm-run-all": "^4.1.5",