Upgrade webpack and webpack-dev-server

Author: andriijas

packages/react-error-overlay/package.json

@@ -64,7 +64,7 @@
     "settle-promise": "1.0.0",
     "source-map": "0.5.6",
     "terser-webpack-plugin": "2.3.0",
-    "webpack": "^4.35.0"
+    "webpack": "5.0.0-beta.9"
   },
   "jest": {
     "setupFiles": [

packages/react-scripts/package.json

@@ -76,8 +76,8 @@
     "terser-webpack-plugin": "2.3.0",
     "ts-pnp": "1.1.5",
     "url-loader": "2.3.0",
-    "webpack": "4.41.2",
-    "webpack-dev-server": "3.9.0",
+    "webpack": "5.0.0-beta.9",
+    "webpack-dev-server": "3.10.0",
     "webpack-manifest-plugin": "2.2.0",
     "workbox-webpack-plugin": "4.3.1"
   },