fix: schema module depends on 'java.util.json' artifactId (was 'json-java21')

Author: simbo1905

json-java21-schema/pom.xml

@@ -24,7 +24,7 @@
     <dependencies>
         <dependency>
             <groupId>io.github.simbo1905.json</groupId>
-            <artifactId>json-java21</artifactId>
+            <artifactId>java.util.json</artifactId>
             <version>${project.version}</version>
         </dependency>