chore(deps): update dependency workbox-webpack-plugin to v6

package.json

@@ -59,7 +59,7 @@
     "webpack-cli": "3.3.0",
     "webpack-dev-server": "3.3.1",
     "webpack-merge": "4.2.1",
-    "workbox-webpack-plugin": "4.3.1",
+    "workbox-webpack-plugin": "6.5.4",
     "worker-loader": "2.0.0"
   }
 }