Bump @github/markdownlint-github in /extensions/ql-vscode

Bumps [@github/markdownlint-github](https://github.com/github/markdownlint-github) from 0.6.3 to 0.8.0.
- [Release notes](https://github.com/github/markdownlint-github/releases)
- [Changelog](https://github.com/github/markdownlint-github/blob/main/CHANGELOG.md)
- [Commits](github/markdownlint-github@v0.6.3...v0.8.0)

---
updated-dependencies:
- dependency-name: "@github/markdownlint-github"
  dependency-version: 0.8.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

extensions/ql-vscode/package.json

@@ -2009,7 +2009,7 @@
     "@babel/preset-react": "^7.26.3",
     "@babel/preset-typescript": "^7.26.0",
     "@faker-js/faker": "^9.0.3",
-    "@github/markdownlint-github": "^0.6.3",
+    "@github/markdownlint-github": "^0.8.0",
     "@jest/environment": "^30.0.0-alpha.7",
     "@jest/environment-jsdom-abstract": "^30.0.0-alpha.7",
     "@microsoft/eslint-formatter-sarif": "^3.1.0",