chore(deps): update dependency webpack to v4.47.0

Author: renovate[bot]

package-lock.json

@@ -71,7 +71,7 @@
     "rimraf": "3.0.2",
     "scratch-gui": "github:scratchfoundation/scratch-gui#scratch-desktop-v3.30.1",
     "uuid": "8.3.2",
-    "webpack": "4.46.0",
+    "webpack": "4.47.0",
     "webpack-merge": "4.2.2"
   },
   "resolutions": {