refactor:[kakao-tech-campus-2nd-step3#84]- refact failure

실패 임시 출력 추가. 추후 로그로 변경

build.gradle

@@ -58,6 +58,7 @@ dependencies {
 	annotationProcessor "jakarta.persistence:jakarta.persistence-api"
 
 	implementation 'org.springframework.boot:spring-boot-starter-data-redis'
+	implementation 'org.springframework.session:spring-session-data-redis'
 
 	// Spring docs
 	implementation 'org.springdoc:springdoc-openapi-starter-webmvc-ui:2.6.0'