fix: update scratch-{vm,webpack-configuration} to fix music extension

Author: cwillisf

package-lock.json

@@ -91,7 +91,7 @@
     "scratch-render-fonts": "^1.0.2",
     "scratch-storage": "^2.3.1",
     "scratch-svg-renderer": "^2.3.102",
-    "scratch-vm": "^4.5.379",
+    "scratch-vm": "^4.5.471",
     "startaudiocontext": "^1.2.1",
     "style-loader": "4.0.0",
     "text-encoding": "^0.7.0",
@@ -136,7 +136,7 @@
     "redux-mock-store": "1.5.4",
     "rimraf": "2.7.1",
     "scratch-semantic-release-config": "1.0.14",
-    "scratch-webpack-configuration": "1.4.0",
+    "scratch-webpack-configuration": "1.5.0",
     "selenium-webdriver": "3.6.0",
     "semantic-release": "19.0.5",
     "stream-browserify": "3.0.0",