Update Javadoc link to graphql-java 21.3

Author: bclozel

build.gradle

@@ -54,7 +54,7 @@ configure(moduleProjects) {
 	ext.javadocLinks = [
 			"https://docs.oracle.com/en/java/javase/17/docs/api/",
 			"https://docs.spring.io/spring-framework/docs/6.1.x/javadoc-api/",
-			"https://javadoc.io/doc/com.graphql-java/graphql-java/20.7/"
+			"https://javadoc.io/doc/com.graphql-java/graphql-java/21.3/"
 	] as String[]
 
 	components.java.withVariantsFromConfiguration(configurations.testFixturesApiElements) { skip() }