Update dependency graphql to ^0.13.0

Author: renovate-bot

arks-gallery-server/package-lock.json

@@ -14,7 +14,7 @@
     "express": "^4.16.2",
     "firebase-admin": "^5.10.0",
     "firebase-functions": "^0.9.0",
-    "graphql": "^0.11.7",
+    "graphql": "^0.13.0",
     "graphql-tools": "^2.21.0"
   },
   "devDependencies": {