chore(deps): update dependency css-minimizer-webpack-plugin to v4 (#57)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

templates/app/package.json

@@ -41,7 +41,7 @@
     "copy-webpack-plugin": "11.0.0",
     "cross-env": "^7.0.3",
     "css-loader": "^6.7.1",
-    "css-minimizer-webpack-plugin": "^3.4.1",
+    "css-minimizer-webpack-plugin": "4.0.0",
     "cssnano": "^5.1.7",
     "del": "^6.0.0",
     "docdash": "^1.2.0",

templates/react-app/package.json

@@ -53,7 +53,7 @@
     "copy-webpack-plugin": "11.0.0",
     "cross-env": "^7.0.3",
     "css-loader": "^6.7.1",
-    "css-minimizer-webpack-plugin": "^3.4.1",
+    "css-minimizer-webpack-plugin": "4.0.0",
     "cssnano": "^5.1.7",
     "del": "^6.0.0",
     "docdash": "^1.2.0",