fix(deps): update dependency scratch-audio to v2

Author: renovate[bot]

package-lock.json

@@ -82,7 +82,7 @@
     "react-virtualized": "^9.20.1",
     "redux": "^3.7.2",
     "redux-throttle": "^0.1.1",
-    "scratch-audio": "^1.0.0",
+    "scratch-audio": "^2.0.0",
     "scratch-blocks": "^1.1.6",
     "scratch-l10n": "^4.0.0",
     "scratch-paint": "^2.2.151",