fix(client): unmask connection errors in ClientSessionGroup teardown (#915) #1954

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	22s
checks / test (3.12, lowest-direct, windows-latest)	3m 35s
checks / test (3.10, lowest-direct, windows-latest)	2m 54s
checks / test (3.12, locked, ubuntu-latest)	58s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.11, locked, windows-latest)	2m 38s
checks / test (3.13, lowest-direct, windows-latest)	3m 3s
checks / test (3.10, locked, windows-latest)	2m 33s
checks / test (3.13, locked, ubuntu-latest)	49s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 22s
checks / test (3.11, lowest-direct, windows-latest)	2m 54s
checks / test (3.13, locked, windows-latest)	2m 43s
checks / test (3.14, lowest-direct, windows-latest)	2m 12s
checks / test (3.10, lowest-direct, ubuntu-latest)	56s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 0s
checks / test (3.10, locked, ubuntu-latest)	51s
checks / test (3.12, locked, windows-latest)	3m 39s
checks / test (3.14, locked, windows-latest)	3m 5s
checks / test (3.13, lowest-direct, ubuntu-latest)	56s
checks / test (3.14, locked, ubuntu-latest)	2m 25s
checks / test (3.11, locked, ubuntu-latest)	54s
all-green	3s
	41m 7s

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