parse_stdout.py produces malformed Junit reports #6304

parse_stdout.py has recently stopped working.
This causes Windows timeouts to be reported as a white box instead of a red box in https://dask.org/distributed/test_report.html.

https://github.com/dask/distributed/actions/runs/2293197167

Publish test results: artifacts/windows-latest-3.10-notci1/pytest.xml#L976Error processing result file: not well-formed (invalid token): line 976, column 93