Subshells implemented using tornado event loops on 6.x branch #3365

Job	Run time
check_release	1m 46s
build (ubuntu-latest, 3.9)	5m 1s
link_check	1m 55s
build (ubuntu-latest, 3.13)	4m 53s
Make SDist	20s
build (windows-latest, 3.9)	6m 58s
test_docs	36s
Test Lint	1m 4s
build (windows-latest, 3.13)	7m 37s
build (macos-latest, 3.9)	3m 51s
Test Minimum Versions	2m 30s
Test Prereleases	2m 12s
build (macos-latest, 3.13)	3m 3s
test_without_debugpy (ubuntu-latest, 3.9)	2m 52s
build (ubuntu-latest, pypy-3.9)	5m 7s
build (macos-latest, 3.10)	3m 21s
build (ubuntu-latest, 3.11)	4m 47s
build (ubuntu-latest, 3.12)	5m 54s
Install from SDist and Test	2m 18s
coverage	0s
	1h 6m 5s

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