mypy

gh-145177: Upgrade to Emscripten 6.0.4 (#154743) #22794

Job	Run time
Run mypy on Lib/test/libregrtest	32s
Run mypy on Tools/peg_generator	34s
Run mypy on Tools/cases_generator	33s
Run mypy on Tools/jit	37s
Run mypy on Tools/clinic	37s
Run mypy on Lib/_pyrepl	35s
Run mypy on Tools/check-c-api-docs	31s
Run mypy on Tools/build	30s
Run mypy on Lib/tomllib	28s
	4m 57s

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