Upgrade to GraphQL Java 18.5

Closes gh-797

Author: bclozel

build.gradle

@@ -4,8 +4,8 @@ plugins {
 
 ext {
 moduleProjects = [project(":spring-graphql"), project(":spring-graphql-test")]
-graphQlJavaVersion = "18.3"
-bootVersion = "2.7.9"
+graphQlJavaVersion = "18.5"
+bootVersion = "2.7.15"
 }
 
 description = "Spring for GraphQL"
@@ -69,7 +69,7 @@ configure(moduleProjects) {
 ext.javadocLinks = [
 "https://docs.oracle.com/javase/8/docs/api/",
 "https://docs.spring.io/spring-framework/docs/5.3.x/javadoc-api/",
-"https://javadoc.io/doc/com.graphql-java/graphql-java/18.1/"
+"https://javadoc.io/doc/com.graphql-java/graphql-java/18.5/"
 ] as String[]
 
 components.java.withVariantsFromConfiguration(configurations.testFixturesApiElements) { skip() }