properly close OutStream and various fixes #2777

Job	Run time
build (ubuntu-latest, 3.9)	2m 45s
link_check	2m 0s
check_release	1m 43s
build (ubuntu-latest, 3.13)	3m 1s
Make SDist	21s
build (windows-latest, 3.9)	8m 0s
build (windows-latest, 3.13)	7m 35s
test_docs	39s
Test Lint	48s
Test Minimum Versions	2m 14s
build (macos-latest, 3.9)	3m 13s
build (macos-latest, 3.13)	2m 42s
Test Prereleases	2m 3s
test_without_debugpy (ubuntu-latest, 3.9)	1m 54s
build (ubuntu-latest, pypy-3.9)	4m 4s
build (macos-latest, 3.10)	2m 55s
build (ubuntu-latest, 3.11)	2m 39s
build (ubuntu-latest, 3.12)	2m 50s
Install from SDist and Test	1m 52s
coverage	0s
tests_check	1s
	53m 19s

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