properly close OutStream and various fixes #2781

Job	Run time
build (ubuntu-latest, 3.9)	2m 54s
check_release	1m 43s
build (ubuntu-latest, 3.13)	3m 8s
build (windows-latest, 3.9)	8m 13s
Make SDist	22s
build (windows-latest, 3.13)	8m 4s
build (macos-latest, 3.9)	3m 16s
test_docs	47s
build (macos-latest, 3.13)	5m 15s
build (ubuntu-latest, pypy-3.9)	4m 34s
Test Lint	1m 0s
build (macos-latest, 3.10)	4m 43s
build (ubuntu-latest, 3.11)	2m 55s
Test Minimum Versions	2m 22s
build (ubuntu-latest, 3.12)	3m 6s
Test Prereleases	2m 11s
test_without_debugpy (ubuntu-latest, 3.9)	2m 3s
link_check	2m 3s
Install from SDist and Test	1m 56s
coverage	16s
tests_check	2s
	1h 0m 53s

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