Use meaningful name for MockServerConfigurer bean

Closes gh-14512

spring-boot-project/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/web/reactive/WebTestClientSecurityConfiguration.java

@@ -33,7 +33,7 @@ import org.springframework.test.web.reactive.server.MockServerConfigurer;
 class WebTestClientSecurityConfiguration {
 
 	@Bean
-	public MockServerConfigurer get() {
+	public MockServerConfigurer mockServerConfigurer() {
 		return SecurityMockServerConfigurers.springSecurity();
 	}