mypy

gh-139927: Fix test_embed on OpenIndiana (#142514) #18398

Job	Run time
Run mypy on Tools/peg_generator	20s
Run mypy on Lib/test/libregrtest	22s
Run mypy on Tools/clinic	21s
Run mypy on Lib/_pyrepl	20s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/build	17s
Run mypy on Tools/cases_generator	24s
Run mypy on Tools/jit	18s
	2m 39s

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