Bump org.apache.zookeeper:zookeeper in /dubbo-spring-xml-demo

Bumps org.apache.zookeeper:zookeeper from 3.8.0 to 3.8.3.

---
updated-dependencies:
- dependency-name: org.apache.zookeeper:zookeeper
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

dubbo-spring-xml-demo/pom.xml

@@ -34,7 +34,7 @@
         <dependency>
             <groupId>org.apache.zookeeper</groupId>
             <artifactId>zookeeper</artifactId>
-            <version>3.8.0</version>
+            <version>3.8.3</version>
         </dependency>
     </dependencies>