Polish "Use dedicated method to turn off authentication"

See gh-18538

spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/data/neo4j/DataNeo4jTestPropertiesIntegrationTests.java

@@ -42,7 +42,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 class DataNeo4jTestPropertiesIntegrationTests {
 
 	@Container
-	static final Neo4jContainer<?> neo4j = new Neo4jContainer<>().withAdminPassword(null);
+	static final Neo4jContainer<?> neo4j = new Neo4jContainer<>().withoutAuthentication();
 
 	@Autowired
 	private Environment environment;

spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/data/neo4j/DataNeo4jTestWithIncludeFilterIntegrationTests.java

@@ -43,7 +43,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 class DataNeo4jTestWithIncludeFilterIntegrationTests {
 
 	@Container
-	static final Neo4jContainer<?> neo4j = new Neo4jContainer<>().withAdminPassword(null);
+	static final Neo4jContainer<?> neo4j = new Neo4jContainer<>().withoutAuthentication();
 
 	@Autowired
 	private ExampleService service;