fix(client): unmask connection errors in ClientSessionGroup teardown (#915) #2008

Job	Run time
checks / pre-commit	38s
checks / readme-snippets	16s
checks / test (3.10, lowest-direct, windows-latest)	2m 37s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.10, locked, ubuntu-latest)	56s
checks / test (3.11, lowest-direct, ubuntu-latest)	54s
checks / test (3.11, lowest-direct, windows-latest)	2m 49s
checks / test (3.10, locked, windows-latest)	2m 19s
checks / test (3.10, lowest-direct, ubuntu-latest)	53s
checks / test (3.11, locked, ubuntu-latest)	53s
checks / test (3.12, lowest-direct, windows-latest)	3m 32s
checks / test (3.13, lowest-direct, windows-latest)	3m 9s
checks / test (3.12, locked, ubuntu-latest)	56s
checks / test (3.13, locked, windows-latest)	2m 42s
checks / test (3.11, locked, windows-latest)	2m 32s
checks / test (3.14, lowest-direct, windows-latest)	2m 30s
checks / test (3.12, locked, windows-latest)	3m 55s
checks / test (3.13, lowest-direct, ubuntu-latest)	54s
checks / test (3.13, locked, ubuntu-latest)	54s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 24s
checks / test (3.14, locked, windows-latest)	3m 15s
checks / test (3.14, locked, ubuntu-latest)	2m 30s
all-green	3s
	41m 32s

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