Pull graphql-java with oneof fix and add more tests

[felipe-gdr]

Please make sure you consider the following:

• [n ] Add tests that use __typename in queries
• [n ] Does this change work with all nadel transformations (rename, type rename, hydration, etc)? Add tests for this.
• [n ] Is it worth using hints for this change in order to be able to enable a percentage rollout?
• [y ] Do we need to add integration tests for this change in the graphql gateway?
• [n ] Do we need a pollinator check for this?

[atlassian-cla-bot]

Hooray! All contributors have signed the CLA.

[gnawf]

Cool