chore(deps): bump zookeeper from 3.7.1 to 3.8.1

Bumps zookeeper from 3.7.1 to 3.8.1.

---
updated-dependencies:
- dependency-name: org.apache.zookeeper:zookeeper
  dependency-type: direct:production
  update-type: version-update:semver-minor
...
Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -82,7 +82,7 @@
         <!-- dubbo related -->
         <curator.version>5.4.0</curator.version>
         <dubbo.version>3.1.5</dubbo.version>
-        <zookeeper.version>3.7.1</zookeeper.version>
+        <zookeeper.version>3.8.1</zookeeper.version>
         <!-- apollo -->
         <apollo.version>2.1.0</apollo.version>
         <!-- aliyun -->