Widen the stdio round-trip test's termination grace and overall timeo… #2722

Job	Run time
checks / readme-snippets	16s
checks / pre-commit	36s
checks / test (3.10, lowest-direct, windows-latest)	1m 28s
checks / test (3.10, locked, windows-latest)	1m 23s
checks / test (3.11, lowest-direct, windows-latest)	1m 24s
checks / test (3.12, locked, ubuntu-latest)	59s
checks / test (3.10, lowest-direct, ubuntu-latest)	59s
checks / test (3.13, lowest-direct, windows-latest)	1m 38s
checks / test (3.11, lowest-direct, ubuntu-latest)	54s
checks / test (3.10, locked, ubuntu-latest)	56s
checks / test (3.11, locked, windows-latest)	57s
checks / test (3.12, locked, windows-latest)	1m 17s
checks / test (3.12, lowest-direct, ubuntu-latest)	59s
checks / test (3.13, lowest-direct, ubuntu-latest)	58s
checks / test (3.14, locked, ubuntu-latest)	1m 58s
checks / test (3.11, locked, ubuntu-latest)	51s
checks / test (3.12, lowest-direct, windows-latest)	1m 24s
checks / test (3.14, locked, windows-latest)	2m 20s
checks / test (3.14, lowest-direct, windows-latest)	1m 24s
checks / test (3.14, lowest-direct, ubuntu-latest)	55s
checks / test (3.13, locked, windows-latest)	1m 34s
checks / test (3.13, locked, ubuntu-latest)	46s
all-green	3s
	25m 59s

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