Update dependency mini-css-extract-plugin to v2.9.4 (#503)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -25,7 +25,7 @@
     "copy-webpack-plugin": "13.0.0",
     "css-loader": "7.1.2",
     "html-webpack-plugin": "5.6.3",
-    "mini-css-extract-plugin": "2.9.3",
+    "mini-css-extract-plugin": "2.9.4",
     "postcss": "8.5.6",
     "postcss-loader": "8.1.1",
     "sass": "1.90.0",