The PostCommit Python Xlang IO Direct job is flaky

[github-actions[bot]]

The PostCommit Python Xlang IO Direct is failing over 50% of the time. Please visit https://github.com/apache/beam/actions/workflows/beam_PostCommit_Python_Xlang_IO_Direct.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=7&var-Workflow=PostCommit%20Python%20Xlang%20IO%20Direct