The PreCommit SQL Java8 job is flaky

[github-actions]

The PreCommit SQL Java8 is failing over 50% of the time.
Please visit https://github.com/apache/beam/actions/workflows/beam_PreCommit_SQL_Java8.yml?query=is%3Afailure+branch%3Amaster to see all failed workflow runs.
See also Grafana statistics: http://metrics.beam.apache.org/d/CTYdoxP4z/ga-post-commits-status?orgId=1&viewPanel=3&var-Workflow=PreCommit%20SQL%20Java8