mypy

gh-84393: Remove AIX workaround: re-enable posix_fadvise and f_alloca… #19593

Job	Run time
Run mypy on Lib/_pyrepl	22s
Run mypy on Tools/clinic	19s
Run mypy on Tools/jit	20s
Run mypy on Lib/test/libregrtest	28s
Run mypy on Lib/tomllib	19s
Run mypy on Tools/cases_generator	25s
Run mypy on Tools/build	20s
Run mypy on Tools/peg_generator	25s
Run mypy on Tools/check-c-api-docs	24s
	3m 22s

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