Fix the security vulernability caused by junit's temp folder
Fix the security vulernability caused by junit's temp folder

### What changes are proposed in this pull request?

fix https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15250
see
https://github.com/junit-team/junit4/security/advisories/GHSA-269g-pwp5-87pp

### Why are the changes needed?

The JUnit4 test rule
[TemporaryFolder](https://junit.org/junit4/javadoc/4.13/org/junit/rules/TemporaryFolder.html)
contains a local information disclosure vulnerability.

### Does this PR introduce any user facing changes?

Please list the user-facing changes introduced by your change, including
no

pr-link: Alluxio/alluxio#15667
change-id: cid-85fb2f516d328f389c4fb98450ccee9c115d9109
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