mypy

gh-150397: Fix pyexpat bigmem test (#151329) #21848

Job	Run time
Run mypy on Tools/jit	22s
Run mypy on Tools/build	22s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Lib/_pyrepl	20s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/check-c-api-docs	22s
Run mypy on Tools/clinic	22s
Run mypy on Tools/peg_generator	20s
Run mypy on Tools/cases_generator	17s
	3m 1s

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