[type:bug] fix etcd sync error.

[yunlongn]

Make sure that:

• You have read the contribution guidelines.
• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[codecov-commenter]

Codecov Report

Merging #4911 (a076f3a) into master (40e1f22) will increase coverage by 0.14%.
The diff coverage is 68.18%.

@@             Coverage Diff              @@
##             master    #4911      +/-   ##
============================================
+ Coverage     64.07%   64.22%   +0.14%     
- Complexity     8439     8445       +6     
============================================
  Files          1195     1195              
  Lines         35368    35374       +6     
  Branches       3203     3206       +3     
============================================
+ Hits          22663    22719      +56     
+ Misses        10863    10812      -51     
- Partials       1842     1843       +1     

Files Changed	Coverage Δ
...plugin/divide/handler/DividePluginDataHandler.java	88.23% <0.00%> (-5.52%)	⬇️
.../apache/shenyu/admin/listener/etcd/EtcdClient.java	54.83% <40.00%> (-4.43%)	⬇️
...a/org/apache/shenyu/sync/data/etcd/EtcdClient.java	73.80% <73.33%> (-18.30%)	⬇️
...che/shenyu/sync/data/etcd/EtcdSyncDataService.java	92.23% <77.27%> (+29.24%)	⬆️

... and 5 files with indirect coverage changes

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