Change always_forkserver_on_unix()
to use_multiprocessing_forkserver_on_linux()
#4577
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Description
To be completely honest, I missed that
"spawn"
is the default under macOS while working on PR #4216 & #4306.In the meantime,
DEADLOCK
s #4373 occurred under macos-latest.This PR overrides the multiprocessing default only when we're sure the default is broken.
Suggested changelog entry: