fix flaky PenetrationProtectTimeoutTest

[Roiocam]

This test appears to be flaky in:

• https://github.com/alibaba/jetcache/actions/runs/8259084773/job/22604772428
• https://github.com/alibaba/jetcache/actions/runs/8389104150/job/22974633901

Error:  Tests run: 3, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 2.229 s <<< FAILURE! - in com.alicp.jetcache.embedded.LinkedHashMapCacheTest
Error:  test  Time elapsed: 2.178 s  <<< FAILURE!
java.lang.AssertionError: expected:<2> but was:<1>
    at com.alicp.jetcache.embedded.LinkedHashMapCacheTest.test(LinkedHashMapCacheTest.java:34)

[Roiocam]

The PR https://github.com/alibaba/jetcache/pull/866 has been blocked by this issue, can you take a look? Thanks.

the new failure job caused by this issue:

• https://github.com/alibaba/jetcache/actions/runs/8445643601/job/23133160378
• https://github.com/alibaba/jetcache/actions/runs/8445701708/job/23133317383
• https://github.com/alibaba/jetcache/actions/runs/8445864837/job/23133728533

[areyouok]

顶！

这些测试我也苦恼好久了，就是一直没能去搞定