[fix] 설정 파일 수정

Author: subin930

src/main/resources/application.yml

@@ -13,7 +13,7 @@ spring:
       ddl-auto: update
     properties:
       hibernate:
-        dialect: org.hibernate.dialect.MySQLDialect
+        dialect: org.hibernate.dialect.MySQL8Dialect
         show_sql: true
         format_sql: true
         use_sql_comments: true