Bump css-loader from 6.2.0 to 6.3.0

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 6.2.0 to 6.3.0.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/css-loader@v6.2.0...v6.3.0)

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

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

package.json

@@ -53,7 +53,7 @@
     "babel-loader": "8.2.2",
     "copy-webpack-plugin": "9.0.1",
     "clean-webpack-plugin": "4.0.0",
-    "css-loader": "6.2.0",
+    "css-loader": "6.3.0",
     "file-loader": "6.2.0",
     "gh-pages": "3.2.3",
     "html-webpack-plugin": "5.3.2",