Downgrade webpack and regenerate lockfile

1. Webpack@4.29.4 has a git dependency
2. Add integrity field to all packages in the lock file

package.json

@@ -112,7 +112,7 @@
     "vue-server-renderer": "2.6.6",
     "vue-template-compiler": "2.6.6",
     "vuedraggable": "2.17.0",
-    "webpack": "4.29.4",
+    "webpack": "4.29.3",
     "webpack-cli": "3.2.3",
     "webpack-dev-server": "3.1.14"
   }