Upgrade webpack loaders

Author: alexdevero

package.json

@@ -46,6 +46,7 @@
     "postpackage": "electron-packager ./ --out=./builds"
   },
   "dependencies": {
+    "postcss": "^8.1.4",
     "react": "^17.0.1",
     "react-dom": "^17.0.1"
   },
@@ -55,20 +56,20 @@
     "babel-loader": "^8.1.0",
     "babel-minify-webpack-plugin": "^0.3.1",
     "cross-env": "^7.0.2",
-    "css-loader": "^4.2.2",
+    "css-loader": "^5.0.0",
     "electron": "^9.0.0",
     "electron-devtools-installer": "^3.1.1",
     "electron-packager": "^15.1.0",
-    "file-loader": "^6.0.0",
-    "html-webpack-plugin": "^4.3.0",
-    "mini-css-extract-plugin": "^0.10.0",
-    "postcss-import": "^12.0.1",
-    "postcss-loader": "^3.0.0",
-    "postcss-nested": "^4.2.3",
+    "file-loader": "^6.2.0",
+    "html-webpack-plugin": "^4.5.0",
+    "mini-css-extract-plugin": "^1.2.1",
+    "postcss-import": "^13.0.0",
+    "postcss-loader": "^4.0.4",
+    "postcss-nested": "^5.0.1",
     "postcss-preset-env": "^6.7.0",
     "postcss-pxtorem": "^5.1.1",
-    "style-loader": "^1.2.1",
-    "webpack": "^4.44.1",
+    "style-loader": "^2.0.0",
+    "webpack": "^4.44.2",
     "webpack-cli": "^3.3.12",
     "webpack-dev-server": "^3.11.0"
   }