Support graphql-java 14

Support graphql-java 14: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). federation-jvm is currently pinned to graphql-java 13.0 (see graphql-java.version in the parent pom.xml ). graphql-java 14 has been out for a while now and we'd like to be able to use it…