Fix test_outstream #3124

Job	Run time
check_release	1m 37s
link_check	3m 29s
Make SDist	21s
build (ubuntu-latest, 3.9)	4m 44s
build (ubuntu-latest, 3.10)	4m 40s
test_docs	38s
Test Lint	1m 0s
build (ubuntu-latest, 3.11)	4m 40s
Test Minimum Versions	2m 29s
build (ubuntu-latest, 3.12)	6m 33s
Test Prereleases	2m 1s
test_without_debugpy (ubuntu-latest, 3.9)	29s
build (ubuntu-latest, 3.13)	5m 38s
build (ubuntu-latest, pypy-3.9)	4m 21s
build (ubuntu-latest, pypy-3.10)	3m 39s
build (windows-latest, 3.9)	7m 33s
build (windows-latest, 3.10)	7m 31s
build (windows-latest, 3.11)	6m 51s
build (windows-latest, 3.12)	7m 30s
build (windows-latest, 3.13)	10m 2s
build (windows-latest, pypy-3.9)	8m 2s
build (windows-latest, pypy-3.10)	8m 34s
build (macos-latest, 3.9)	5m 36s
build (macos-latest, 3.10)	4m 57s
build (macos-latest, 3.11)	4m 45s
build (macos-latest, 3.12)	6m 38s
build (macos-latest, 3.13)	5m 31s
build (macos-latest, pypy-3.9)	5m 1s
build (macos-latest, pypy-3.10)	4m 54s
Install from SDist and Test	2m 7s
coverage	0s
	2h 21m 51s

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