fix: app A start

Author: EndlessSeeker

mse-simple-demo/A/pom.xml

@@ -19,7 +19,7 @@
         <spring-cloud.version>2021.0.4</spring-cloud.version>
         <spring-cloud-alibaba.version>2.1.1.RELEASE</spring-cloud-alibaba.version>
         <dubbo.version>2.7.23</dubbo.version>
-        <rocketmq.version>4.9.8</rocketmq.version>
+        <rocketmq.version>4.5.0</rocketmq.version>
     </properties>
 
     <dependencies>