Update GraphQL-Java to fix security vulnerability

Upgrade GraphQL-Java to 19.4 to fix the stack based overflow vulnerability CVE-2023-28867.

(CMS-22878)

Fix NullPointer in wildcard settings query

When calling the wildcard settings query on a content object where local settings are null, previously a NullPointer Exception was thrown. This is now prevented by a null check and instead only returns an empty result.

(CMS-22442)