chore(deps-dev): bump mini-css-extract-plugin from 2.9.2 to 2.9.4

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 2.9.2 to 2.9.4.
- [Release notes](https://github.com/webpack-contrib/mini-css-extract-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/mini-css-extract-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack/mini-css-extract-plugin@v2.9.2...v2.9.4)

---
updated-dependencies:
- dependency-name: mini-css-extract-plugin
  dependency-version: 2.9.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -142,7 +142,7 @@
     "jest-serializer-vue": "^3.1.0",
     "kolibri-format": "1.0.1",
     "kolibri-tools": "0.18.2",
-    "mini-css-extract-plugin": "^2.8.1",
+    "mini-css-extract-plugin": "^2.9.4",
     "node-sass": "9.0.0",
     "npm-run-all": "^4.1.3",
     "postcss-html": "^1.8.0",