update db properties

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/multipledb/JpaMultipleDBIntegrationTest.java

@@ -12,7 +12,6 @@ import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.dao.DataIntegrityViolationException;
-import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.transaction.annotation.EnableTransactionManagement;
 import org.springframework.transaction.annotation.Transactional;