mypy

GH-128939: Refactor JIT optimize structs #11714

Job	Run time
Run mypy on Lib/_pyrepl	22s
Run mypy on Lib/test/libregrtest	22s
Run mypy on Tools/build	21s
Run mypy on Tools/cases_generator	25s
Run mypy on Tools/clinic	29s
Run mypy on Tools/jit	26s
Run mypy on Tools/peg_generator	23s
Run mypy on Tools/wasm	23s
	3m 11s

Provide feedback