fix: race condition in test_posix.TestProcess.test_cmdline #2153
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Summary
Description
On macOS the official python installer exposes a python wrapper that executes a python executable hidden inside an application bundle inside the Python framework.
There's a race condition in in test_posix.TestProcess.test_cmdline between the ps call & the psutil call depending on the completion of the execve call so let's retry on failure for this test.