Bump org.apache.zookeeper:zookeeper (#14684)

Bumps org.apache.zookeeper:zookeeper from 3.8.3 to 3.8.4.

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

dubbo-spring-boot/dubbo-spring-boot-starters/dubbo-zookeeper-spring-boot-starter/pom.xml

@@ -30,7 +30,7 @@
   <description>Apache Dubbo Zookeeper Spring Boot Starter</description>
 
   <properties>
-    <zookeeper_version>3.8.3</zookeeper_version>
+    <zookeeper_version>3.8.4</zookeeper_version>
   </properties>
 
   <dependencies>