Detect parent change in more cases on unix (#1271) #2564

Job	Run time
check_release	1m 46s
build (ubuntu-latest, 3.8)	3m 7s
link_check	1m 47s
build (ubuntu-latest, 3.12)	3m 46s
Make SDist	26s
build (windows-latest, 3.8)	9m 0s
build (windows-latest, 3.12)	8m 59s
test_docs	44s
build (macos-latest, 3.8)	5m 48s
Test Lint	1m 0s
build (macos-latest, 3.12)	3m 21s
Test Minimum Versions	2m 16s
Test Prereleases	2m 3s
build (windows-latest, 3.9)	8m 58s
test_without_debugpy (ubuntu-latest, 3.9)	2m 2s
build (ubuntu-latest, pypy-3.9)	3m 3s
build (macos-latest, 3.10)	2m 52s
build (ubuntu-latest, 3.11)	3m 16s
Install from SDist and Test	2m 9s
coverage	11s
tests_check	1s
	1h 6m 35s

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