Fixup SSH connector tests for Python 3.12 #1259

Job	Run time
type-check	29s
lint	33s
end-to-end-test (ubuntu-20.04, local)	37s
end-to-end-test (ubuntu-20.04, ssh)	1m 22s
end-to-end-test (ubuntu-20.04, docker)	29s
unit-test (ubuntu-20.04, 3.7)	1m 12s
end-to-end-test (ubuntu-latest, local)	32s
unit-test (ubuntu-20.04, 3.8)	1m 8s
end-to-end-test (ubuntu-latest, ssh)	1m 28s
unit-test (ubuntu-20.04, 3.9)	1m 14s
end-to-end-test (ubuntu-latest, docker)	36s
unit-test (ubuntu-20.04, 3.10)	1m 12s
end-to-end-test (macos-latest, local)	27s
unit-test (ubuntu-20.04, 3.11)	1m 7s
unit-test (ubuntu-20.04, 3.12)	1m 6s
unit-test (ubuntu-latest, 3.7)	1m 2s
unit-test (ubuntu-latest, 3.8)	1m 15s
unit-test (ubuntu-latest, 3.9)	1m 1s
unit-test (ubuntu-latest, 3.10)	1m 14s
unit-test (ubuntu-latest, 3.11)	57s
unit-test (ubuntu-latest, 3.12)	1m 8s
unit-test (macos-12, 3.11)	1m 23s
unit-test (windows-2022, 3.11)	1m 46s
tests-done	2s
	23m 20s

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