chore(sonar): don't use java 9 language

Author: oliemansm

graphql-spring-boot-autoconfigure/src/test/java/graphql/kickstart/autoconfigure/editor/voyager/VoyagerWithCsrfTest.java

@@ -10,7 +10,7 @@
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.autoconfigure.security.reactive.ReactiveSecurityAutoConfiguration;
+import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;
 import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.context.annotation.Import;
@@ -21,7 +21,9 @@
 
 @ExtendWith(SpringExtension.class)
 @Import(PermitAllWebSecurity.class)
-@SpringBootTest(classes = {VoyagerAutoConfiguration.class, ReactiveSecurityAutoConfiguration.class})
+@SpringBootTest(
+    classes = {VoyagerAutoConfiguration.class, SecurityAutoConfiguration.class},
+    properties = {"spring.main.web-application-type=servlet"})
 @AutoConfigureMockMvc
 @ActiveProfiles("voyager")
 class VoyagerWithCsrfTest {