fix(client): unmask connection errors in ClientSessionGroup teardown (#915) #2000

Job	Run time
checks / readme-snippets	10s
checks / pre-commit	33s
checks / test (3.12, lowest-direct, ubuntu-latest)	55s
checks / test (3.10, lowest-direct, ubuntu-latest)	50s
checks / test (3.12, locked, ubuntu-latest)	54s
checks / test (3.11, locked, ubuntu-latest)	51s
checks / test (3.10, lowest-direct, windows-latest)	2m 40s
checks / test (3.12, lowest-direct, windows-latest)	3m 15s
checks / test (3.11, lowest-direct, ubuntu-latest)	54s
checks / test (3.11, locked, windows-latest)	13s
checks / test (3.10, locked, windows-latest)	2m 15s
checks / test (3.10, locked, ubuntu-latest)	50s
checks / test (3.13, locked, ubuntu-latest)	50s
checks / test (3.13, lowest-direct, ubuntu-latest)	52s
checks / test (3.11, lowest-direct, windows-latest)	3m 1s
checks / test (3.13, lowest-direct, windows-latest)	2m 21s
checks / test (3.12, locked, windows-latest)	3m 21s
checks / test (3.14, locked, ubuntu-latest)	2m 19s
checks / test (3.14, lowest-direct, windows-latest)	2m 33s
checks / test (3.13, locked, windows-latest)	2m 38s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 20s
checks / test (3.14, locked, windows-latest)	3m 41s
all-green	3s
	37m 19s

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