mypy

gh-151929: Add pythoninfo-build command to Platforms/emscripten (#152… #22100

Job	Run time
Run mypy on Lib/test/libregrtest	21s
Run mypy on Lib/_pyrepl	19s
Run mypy on Tools/jit	21s
Run mypy on Tools/build	17s
Run mypy on Tools/clinic	19s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/cases_generator	20s
	2m 53s

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