fix(client): unmask connection errors in ClientSessionGroup teardown (#915) #1995

Job	Run time
checks / pre-commit	24s
checks / readme-snippets	13s
checks / test (3.11, lowest-direct, ubuntu-latest)	55s
checks / test (3.10, lowest-direct, windows-latest)	2m 40s
checks / test (3.10, lowest-direct, ubuntu-latest)	48s
checks / test (3.10, locked, windows-latest)	2m 25s
checks / test (3.11, locked, windows-latest)	2m 51s
checks / test (3.12, locked, windows-latest)	3m 20s
checks / test (3.11, lowest-direct, windows-latest)	3m 1s
checks / test (3.12, lowest-direct, ubuntu-latest)	56s
checks / test (3.12, locked, ubuntu-latest)	53s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.13, locked, windows-latest)	2m 42s
checks / test (3.14, locked, ubuntu-latest)	2m 21s
checks / test (3.13, lowest-direct, windows-latest)	2m 31s
checks / test (3.11, locked, ubuntu-latest)	48s
checks / test (3.12, lowest-direct, windows-latest)	3m 31s
checks / test (3.14, lowest-direct, windows-latest)	2m 19s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.14, locked, windows-latest)	3m 10s
checks / test (3.10, locked, ubuntu-latest)	46s
checks / test (3.13, lowest-direct, ubuntu-latest)	50s
all-green	3s
	39m 26s

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