Upgrade supported graphql-java version

Author: oliemansm

content/servlet/_index.md

@@ -15,7 +15,7 @@ into the aspects of GraphQL Java as well, make sure to look at the
 [GraphQL Java documentation](https://www.graphql-java.com/documentation/latest/) for more in depth details
 regarding GraphQL Java itself.
 
-We try to stay up to date with GraphQL Java as much as possible. The current version supports **GraphQL Java 10.0**.
+We try to stay up to date with GraphQL Java as much as possible. The current version supports **GraphQL Java 14.0**.
 
 This project requires at least Java 8.