Update dependency mini-css-extract-plugin to v2

package.json

@@ -10,7 +10,7 @@
     "file-loader": "6.2.0",
     "glob": "7.2.0",
     "jquery": "3.6.0",
-    "mini-css-extract-plugin": "1.6.2",
+    "mini-css-extract-plugin": "2.4.2",
     "open-iconic": "1.1.1",
     "purgecss-webpack-plugin": "4.0.3",
     "raw-loader": "4.0.2",