fix(client): unmask connection errors in ClientSessionGroup teardown (#915) #2004

Job	Run time
checks / pre-commit	20s
checks / readme-snippets	11s
checks / test (3.10, lowest-direct, windows-latest)	2m 23s
checks / test (3.12, lowest-direct, windows-latest)	3m 18s
checks / test (3.11, locked, ubuntu-latest)	50s
checks / test (3.10, locked, windows-latest)	2m 1s
checks / test (3.13, lowest-direct, windows-latest)	2m 33s
checks / test (3.14, locked, windows-latest)	2m 59s
checks / test (3.11, lowest-direct, windows-latest)	2m 41s
checks / test (3.12, locked, windows-latest)	3m 14s
checks / test (3.12, locked, ubuntu-latest)	46s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.10, lowest-direct, ubuntu-latest)	48s
checks / test (3.13, locked, windows-latest)	2m 28s
checks / test (3.12, lowest-direct, ubuntu-latest)	53s
checks / test (3.14, locked, ubuntu-latest)	2m 18s
checks / test (3.13, lowest-direct, ubuntu-latest)	48s
checks / test (3.11, locked, windows-latest)	2m 21s
checks / test (3.10, locked, ubuntu-latest)	48s
checks / test (3.13, locked, ubuntu-latest)	45s
checks / test (3.14, lowest-direct, windows-latest)	2m 30s
checks / test (3.11, lowest-direct, ubuntu-latest)	52s
all-green	4s
	37m 7s

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