Does not work with graphql >= 16

graphql-js removed support for positional arguments in the call to `graphql`. It must now be a single `GraphQLArgs` object.

Passing it as positional arguments (i.e. schema first meaning that schema is the args object) will result in:
```
Expected ${inspect(schema)} to be a GraphQL schema.
```

As it tries to use `args.schema` on the schema itself.