DRAFT: Free threading testing with pytest-run-parallel

[cclauss]

https://py-free-threading.github.io/testing --> https://github.com/Quansight-Labs/pytest-run-parallel

************************** pytest-run-parallel report **************************
82 tests were not run in parallel because of use of thread-unsafe functionality, to list the tests
    that were not run in parallel, re-run while setting PYTEST_RUN_PARALLEL_VERBOSE=1 in your shell
    environment
============================== 82 passed in 0.74s ==============================

[codecov]

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