Subshells implemented using tornado event loops on 6.x branch #3315

Job	Run time
build (ubuntu-latest, 3.9)	8m 6s
build (ubuntu-latest, 3.13)	3m 7s
check_release	1m 50s
build (windows-latest, 3.9)	11m 31s
build (windows-latest, 3.13)	6m 37s
Test Lint	1m 2s
build (macos-latest, 3.9)	4m 59s
build (macos-latest, 3.13)	4m 49s
build (ubuntu-latest, pypy-3.9)	4m 22s
link_check	3m 36s
Make SDist	18s
build (macos-latest, 3.10)	4m 49s
build (ubuntu-latest, 3.11)	3m 12s
build (ubuntu-latest, 3.12)	8m 26s
test_docs	38s
Test Minimum Versions	2m 19s
Test Prereleases	2m 10s
test_without_debugpy (ubuntu-latest, 3.9)	2m 14s
Install from SDist and Test	2m 8s
coverage	0s
	1h 16m 13s

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