mypy

gh-131238: Move pycore_obmalloc.h include to pycore_runtime_structs.h… #13100

Job	Run time
Run mypy on Lib/_pyrepl	21s
Run mypy on Lib/test/libregrtest	17s
Run mypy on Tools/build	17s
Run mypy on Tools/cases_generator	17s
Run mypy on Tools/clinic	16s
Run mypy on Tools/jit	22s
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/wasm	15s
	2m 24s

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