chore(deps): bump css-loader from 5.2.7 to 6.5.1 (#6353)

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 5.2.7 to 6.5.1.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/css-loader/compare/v5.2.7...v6.5.1)

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

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

packages/docusaurus/package.json

@@ -59,7 +59,7 @@
     "commander": "^5.1.0",
     "copy-webpack-plugin": "^9.0.1",
     "core-js": "^3.18.0",
-    "css-loader": "^5.1.1",
+    "css-loader": "^6.5.1",
     "css-minimizer-webpack-plugin": "^3.3.1",
     "cssnano": "^5.0.8",
     "del": "^6.0.0",