[test] Unstable test AdjustIsrITCase.testIsrShrinkAndExpand

[github-actions]

https://github.com/apache/fluss/actions/runs/23314840571/job/67811430326

[ERROR] org.apache.fluss.server.replica.AdjustIsrITCase.testIsrShrinkAndExpand  Time elapsed: 0.054 s  <<< FAILURE!
org.opentest4j.AssertionFailedError: