Update task to use Milestone build

Updated partitioned sample readme

Updated samples base boot version

Updated jpa sample to use jakarta

spring-cloud-task-samples/jpa-sample/src/test/java/io/spring/JpaApplicationTests.java

@@ -24,7 +24,7 @@ import javax.sql.DataSource;
 import org.h2.tools.Server;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
-// import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 
 
@@ -93,7 +93,7 @@ public class JpaApplicationTests {
 		this.server.stop();
 	}
 
-	// @Test
+	@Test
 	public void testBatchJobApp(CapturedOutput capturedOutput) {
 		final String INSERT_MESSAGE = "Hibernate: insert into task_run_output (";
 		this.context = SpringApplication