mypy

Use bytecodealliance/setup-wasi-sdk-action to install the WASI SDK (#… #19789

Job	Run time
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/check-c-api-docs	11s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/jit	17s
Run mypy on Lib/_pyrepl	20s
Run mypy on Tools/clinic	20s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/build	25s
	2m 52s

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