Bump css-loader from 6.3.0 to 6.4.0

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 6.3.0 to 6.4.0.
- [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/v6.3.0...v6.4.0)

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

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

package.json

@@ -13,7 +13,7 @@
         "@fortawesome/free-solid-svg-icons": "^5.15.4",
         "@fortawesome/vue-fontawesome": "^3.0.0-4",
         "core-js": "3.18.2",
-        "css-loader": "^6.3.0",
+        "css-loader": "^6.4.0",
         "dompurify": "^2.3.3",
         "hotkeys-js": "^3.8.7",
         "javascript-time-ago": "^2.3.9",