Updated graphql-java to 20.9

The dependency com.graphql-java:graphql-java was updated to version 20.9 to handle the security issue CVE-2024-40094. This change is breaking, as stricter rules apply to introspection queries. See https://github.com/graphql-java/graphql-java/releases/tag/v20.9 for details.

(CMS-25437)