Update dependency graphql to ^16.8.0

Author: renovate[bot]

package.json

@@ -16,7 +16,7 @@
     "@graphql-ez/plugin-graphiql": "^0.12.0",
     "@graphql-ez/plugin-schema": "^0.9.0",
     "gqty": "^2.3.0",
-    "graphql": "^16.6.0",
+    "graphql": "^16.8.0",
     "graphql-ez": "^0.16.0",
     "next": "^13.2.4",
     "react": "^18.2.0",