fix(deps): update dependency pubsub-js to v1.9.3

Author: renovate-bot

package-lock.json

@@ -66,7 +66,7 @@
     "lodash.memoize": "4.1.2",
     "lodash.merge": "4.6.2",
     "lodash.snakecase": "4.1.1",
-    "pubsub-js": "1.7.0",
+    "pubsub-js": "1.9.3",
     "react-intl": "2.9.0",
     "universal-cookie": "4.0.4"
   },