[test] Unstable test Flink119TableSourceITCase.testLookupInsertIfNotExists

[github-actions]

https://github.com/apache/fluss/actions/runs/23095392185/job/67086933773

[ERROR] org.apache.fluss.flink.source.Flink119TableSourceITCase.testLookupInsertIfNotExists(boolean)[1]  Time elapsed: 61.483 s  <<< FAILURE!
java.lang.AssertionError: