chore: bump mini-css-extract-plugin from 2.9.2 to 2.9.4 (#398)

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

Author: dependabot[bot]

package-lock.json

@@ -66,7 +66,7 @@
     "ignore": "^7.0.5",
     "lazysizes": "^5.3.2",
     "lodash": "^4.17.21",
-    "mini-css-extract-plugin": "^2.9.2",
+    "mini-css-extract-plugin": "^2.9.4",
     "normalise": "^10.0.0",
     "normalize.css": "^8.0.1",
     "null-loader": "^4.0.1",