Bump css-loader from 6.8.1 to 6.9.0 in /extensions/ql-vscode (#3256)

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 6.8.1 to 6.9.0.
- [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@v6.8.1...v6.9.0)

---
updated-dependencies:
- dependency-name: css-loader
  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

@@ -2018,7 +2018,7 @@
     "applicationinsights": "^2.9.2",
     "cosmiconfig": "^9.0.0",
     "cross-env": "^7.0.3",
-    "css-loader": "^6.8.1",
+    "css-loader": "^6.9.0",
     "del": "^6.0.0",
     "eslint": "^8.56.0",
     "eslint-config-prettier": "^9.0.0",