mypy

gh-138451: Support custom LLVM installation path (#138452) #10452

Job	Run time
Run mypy on Tools/build	22s
Run mypy on Tools/peg_generator	21s
Run mypy on Lib/tomllib	19s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/clinic	16s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Tools/cases_generator	15s
Run mypy on Lib/_pyrepl	21s
Run mypy on Tools/jit	22s
	2m 51s

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