mypy

gh-144766: Fix a crash in fork child process when perf support is ena… #19524

Job	Run time
Run mypy on Tools/cases_generator	20s
Run mypy on Tools/check-c-api-docs	16s
Run mypy on Tools/build	18s
Run mypy on Lib/_pyrepl	20s
Run mypy on Tools/clinic	20s
Run mypy on Tools/jit	24s
Run mypy on Tools/peg_generator	22s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Lib/tomllib	17s
	2m 57s

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