remove serializer

jetlinks-standalone/src/main/resources/application.yml

@@ -22,7 +22,6 @@ spring:
       pool:
         max-active: 1024
     timeout: 20s
-    serializer: jdk # 设置fst时,redis key使用string序列化,value使用 fst序列化.
 #    database: 3
   #        max-wait: 10s
   r2dbc: