mypy

gh-145541: Fix `InvalidStateError` in `BaseSubprocessTransport._call_… #19833

Job	Run time
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/build	20s
Run mypy on Tools/peg_generator	19s
Run mypy on Lib/_pyrepl	16s
Run mypy on Tools/check-c-api-docs	21s
Run mypy on Tools/jit	38s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/clinic	20s
Run mypy on Lib/tomllib	17s
	3m 8s

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