mypy

gh-62259: Add Tools/unicode/gen_expat_table.py (GH-150503) #21821

Job	Run time
Run mypy on Tools/jit	20s
Run mypy on Tools/build	19s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/check-c-api-docs	19s
Run mypy on Tools/clinic	19s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/peg_generator	19s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/cases_generator	18s
	2m 48s

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