mypy

gh-152132: Close stderr_copy in test_api.test_run (#153591) #22484

Job	Run time
Run mypy on Tools/peg_generator	29s
Run mypy on Tools/cases_generator	31s
Run mypy on Lib/test/libregrtest	37s
Run mypy on Lib/tomllib	28s
Run mypy on Tools/clinic	31s
Run mypy on Tools/check-c-api-docs	26s
Run mypy on Tools/build	33s
Run mypy on Tools/jit	30s
Run mypy on Lib/_pyrepl	35s
	4m 40s

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