Update extended scalars to v21

Author: dondonz

build.gradle

@@ -41,8 +41,7 @@ repositories {
 
 dependencies {
     api "com.graphql-java:graphql-java:21.0"
-    // todo: upgrade to 21.0
-    api "com.graphql-java:graphql-java-extended-scalars:20.0"
+    api "com.graphql-java:graphql-java-extended-scalars:21.0"
     api "org.hibernate.validator:hibernate-validator:7.0.1.Final"
     api "org.glassfish:jakarta.el:4.0.2"