Subshells implemented using tornado event loops on 6.x branch #3318

Job	Run time
check_release	1m 41s
Make SDist	30s
build (ubuntu-latest, 3.9)	5m 1s
build (ubuntu-latest, 3.13)	4m 54s
test_docs	42s
Test Lint	46s
build (windows-latest, 3.9)	5m 21s
build (windows-latest, 3.13)	5m 23s
Test Minimum Versions	5m 32s
build (macos-latest, 3.9)	4m 46s
Test Prereleases	2m 15s
build (macos-latest, 3.13)	4m 59s
build (ubuntu-latest, pypy-3.9)	5m 28s
test_without_debugpy (ubuntu-latest, 3.9)	2m 4s
link_check	1m 49s
build (macos-latest, 3.10)	4m 54s
build (ubuntu-latest, 3.11)	2m 23s
build (ubuntu-latest, 3.12)	5m 30s
Install from SDist and Test	2m 34s
coverage	1s
	1h 6m 33s

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