Use `multiprocessing` `start_method` `"spawn"`#4305

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rwgk wants to merge 2 commits intopybind:masterfrom

rwgk:test_gil_scoped_multiprocessing_spawn

Commits on Nov 1, 2022

Use `multiprocessing` `start_method` `"spawn"`
rwgk
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Commits on Nov 2, 2022

Use `multiprocessing.set_start_method("spawn")` in conftest.py (very similar to #4306, the only difference between the two PRs is the `"spawn"` vs `"forkserver"` argument).
rwgk
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