Bump css-loader from 3.1.0 to 6.8.1 in /extensions/ql-vscode

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 3.1.0 to 6.8.1.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](webpack/css-loader@v3.1.0...v6.8.1)

---
updated-dependencies:
- dependency-name: css-loader
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

extensions/ql-vscode/package-lock.json

@@ -1746,7 +1746,7 @@
     "ansi-colors": "^4.1.1",
     "applicationinsights": "^2.3.5",
     "cross-env": "^7.0.3",
-    "css-loader": "~3.1.0",
+    "css-loader": "~6.8.1",
     "del": "^6.0.0",
     "esbuild": "^0.15.15",
     "eslint": "^8.23.1",