Bump webpack (#7423)

build-scripts/webpack.js

@@ -45,10 +45,8 @@ const createWebpackConfig = ({
     optimization: {
       minimizer: [
         new TerserPlugin({
-          cache: true,
           parallel: true,
           extractComments: true,
-          sourceMap: true,
           terserOptions: bundle.terserOptions(latestBuild),
         }),
       ],

package.json

@@ -204,15 +204,15 @@
     "sinon": "^7.3.1",
     "source-map-url": "^0.4.0",
     "systemjs": "^6.3.2",
-    "terser-webpack-plugin": "^3.0.6",
+    "terser-webpack-plugin": "^5.0.0",
     "ts-lit-plugin": "^1.2.1",
     "ts-mocha": "^7.0.0",
     "typescript": "^4.0.3",
     "vinyl-buffer": "^1.0.1",
     "vinyl-source-stream": "^2.0.0",
-    "webpack": "5.0.0-rc.3",
-    "webpack-cli": "4.0.0-rc.0",
-    "webpack-dev-server": "^3.10.3",
+    "webpack": "5.1.3",
+    "webpack-cli": "4.1.0",
+    "webpack-dev-server": "^3.11.0",
     "webpack-manifest-plugin": "3.0.0-rc.0",
     "workbox-build": "^5.1.3"
   },