chore(deps): update dependency graphql to v16

Author: renovate-bot

examples/package.json

@@ -34,7 +34,7 @@
     "apollo-server-plugin-base": "3.4.0",
     "apollo-server-types": "3.4.0",
     "class-validator": "0.13.1",
-    "graphql": "15.7.2",
+    "graphql": "16.4.0",
     "graphql-query-complexity": "0.11.0",
     "graphql-tools": "8.2.0",
     "mongoose": "5.12.0",