socket must be None, not shell_socket for default shell #2599

Job	Run time
Test Lint	1m 11s
check_release	1m 49s
test_docs	44s
build (ubuntu-latest, 3.8)	3m 31s
Test Minimum Versions	2m 20s
build (ubuntu-latest, 3.12)	3m 31s
Test Prereleases	2m 5s
build (windows-latest, 3.8)	13m 3s
test_without_debugpy (ubuntu-latest, 3.9)	2m 1s
build (windows-latest, 3.12)	9m 10s
build (macos-latest, 3.8)	6m 6s
build (macos-latest, 3.12)	3m 31s
build (windows-latest, 3.9)	7m 21s
build (ubuntu-latest, pypy-3.9)	3m 25s
build (macos-latest, 3.10)	3m 11s
build (ubuntu-latest, 3.11)	3m 7s
link_check	3m 29s
Make SDist	25s
Install from SDist and Test	1m 59s
coverage	7s
tests_check	2s
	1h 12m 8s

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