Polishing: fix some compiler warnings

spring-boot-samples/spring-boot-sample-data-neo4j/src/main/java/sample/data/neo4j/CustomerRepository.java

@@ -20,7 +20,6 @@ import java.util.List;
 
 import org.springframework.data.neo4j.repository.GraphRepository;
 
-@SuppressWarnings("deprecation")
 public interface CustomerRepository extends GraphRepository<Customer> {
 
 	public Customer findByFirstName(String firstName);

spring-boot-samples/spring-boot-sample-data-neo4j/src/main/java/sample/data/neo4j/SampleNeo4jApplication.java

@@ -27,7 +27,6 @@ public class SampleNeo4jApplication implements CommandLineRunner {
 	@Autowired
 	private CustomerRepository repository;
 
-	@SuppressWarnings("deprecation")
 	@Override
 	public void run(String... args) throws Exception {
 		this.repository.deleteAll();