mypy

gh-140348: Fix using | on unusual objects plus Unions (#140383) #17656

Job	Run time
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/clinic	20s
Run mypy on Lib/_pyrepl	20s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/build	17s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/jit	19s
	2m 27s

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