fix keep-alive-time

ad-engine-server/src/main/resources/application.yml

@@ -131,7 +131,7 @@ grpc:
       negotiationType: PLAINTEXT
       # KeepAlive 配置（防止空闲连接被网关关闭）
       enable-keep-alive: true
-      keep-alive-time: 30s
+      keep-alive-time: 20s
       keep-alive-timeout: 5s
       keep-alive-without-calls: true
     recommend-server: