Bump org.apache.zookeeper:zookeeper (#13930)

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
...

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diff --git a/dubbo-spring-boot/dubbo-spring-boot-starters/dubbo-zookeeper-curator5-spring-boot-starter/pom.xml b/dubbo-spring-boot/dubbo-spring-boot-starters/dubbo-zookeeper-curator5-spring-boot-starter/pom.xml
index 5413194..3ce640c 100644
--- a/dubbo-spring-boot/dubbo-spring-boot-starters/dubbo-zookeeper-curator5-spring-boot-starter/pom.xml
+++ b/dubbo-spring-boot/dubbo-spring-boot-starters/dubbo-zookeeper-curator5-spring-boot-starter/pom.xml
@@ -31,7 +31,7 @@
 
   <properties>
     <curator5_version>5.1.0</curator5_version>
-    <zookeeper_version>3.8.3</zookeeper_version>
+    <zookeeper_version>3.8.4</zookeeper_version>
   </properties>
 
   <dependencyManagement>