chore(deps): update dependency mini-css-extract-plugin to v2.9.0

Author: renovate[bot]

frontend/package.json

@@ -30,7 +30,7 @@
     "core-js": "3.21.1",
     "css-loader": "6.7.1",
     "fork-ts-checker-webpack-plugin": "6.5.1",
-    "mini-css-extract-plugin": "2.6.0",
+    "mini-css-extract-plugin": "2.9.0",
     "mustache": "4.2.0",
     "node-sass": "7.0.1",
     "postcss": "8.4.12",