optimize: fix unit test in java 21

[wangliang181230]

optimize: fix unit test in java 21
优化：修复单元测试在java21下运行异常的问题。

actions测试成功记录：

all：https://github.com/wangliang181230/seata/actions
build.yml：https://github.com/wangliang181230/seata/actions/runs/6272155537
test.yml：https://github.com/wangliang181230/seata/actions/runs/6272155540
test-druid.yml：https://github.com/wangliang181230/seata/actions/runs/6272155538

[codecov]

Codecov Report

Merging #5862 (8f1f0dd) into develop (ecb7ef7) will decrease coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #5862      +/-   ##
=============================================
- Coverage      48.87%   48.87%   -0.01%     
+ Complexity      4154     4153       -1     
=============================================
  Files            777      777              
  Lines          27944    27944              
  Branches        3412     3412              
=============================================
- Hits           13659    13657       -2     
- Misses         12857    12863       +6     
+ Partials        1428     1424       -4     

see 3 files with indirect coverage changes

[slievrly]

LGTM