fix: close all memory stream ends in client transport cleanup #1394

Job	Run time
checks / pre-commit	35s
checks / readme-snippets	14s
checks / test (3.10, locked, ubuntu-latest)	53s
checks / test (3.10, locked, windows-latest)	2m 21s
checks / test (3.13, lowest-direct, ubuntu-latest)	56s
checks / test (3.12, lowest-direct, windows-latest)	3m 47s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.10, lowest-direct, ubuntu-latest)	59s
checks / test (3.12, locked, windows-latest)	3m 24s
checks / test (3.11, lowest-direct, ubuntu-latest)	53s
checks / test (3.11, lowest-direct, windows-latest)	2m 49s
checks / test (3.14, locked, ubuntu-latest)	2m 22s
checks / test (3.14, lowest-direct, windows-latest)	2m 32s
checks / test (3.14, locked, windows-latest)	3m 21s
checks / test (3.12, locked, ubuntu-latest)	57s
checks / test (3.11, locked, ubuntu-latest)	50s
checks / test (3.13, lowest-direct, windows-latest)	2m 41s
checks / test (3.13, locked, ubuntu-latest)	47s
checks / test (3.11, locked, windows-latest)	2m 28s
checks / test (3.13, locked, windows-latest)	3m 3s
checks / test (3.10, lowest-direct, windows-latest)	2m 29s
all-green	3s
	40m 49s

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