Update dependency graphql to v16

Author: renovate[bot]

graphql-workspace/day1/sample-graphql/package.json

@@ -12,6 +12,6 @@
   "dependencies": {
     "express": "^4.16.3",
     "express-graphql": "^0.6.12",
-    "graphql": "^14.0.2"
+    "graphql": "^16.0.0"
   }
 }