Subshells implemented using tornado event loops on 6.x branch #3330

Job	Run time
check_release	1m 43s
test_docs	41s
Test Lint	1m 2s
build (ubuntu-latest, 3.9)	5m 2s
Test Minimum Versions	7m 28s
build (ubuntu-latest, 3.13)	4m 55s
Test Prereleases	2m 9s
test_without_debugpy (ubuntu-latest, 3.9)	2m 7s
build (windows-latest, 3.9)	8m 40s
build (windows-latest, 3.13)	8m 22s
link_check	3m 49s
build (macos-latest, 3.9)	7m 58s
Make SDist	18s
build (macos-latest, 3.13)	9m 37s
build (ubuntu-latest, pypy-3.9)	5m 57s
build (macos-latest, 3.10)	7m 37s
build (ubuntu-latest, 3.11)	4m 47s
build (ubuntu-latest, 3.12)	5m 46s
Install from SDist and Test	3m 45s
coverage	0s
	1h 31m 43s

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