mypy

gh-138122: Improve the profiling section in the 3.15 what's new docum… #18315

Job	Run time
Run mypy on Lib/test/libregrtest	17s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/build	17s
Run mypy on Lib/tomllib	19s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/clinic	18s
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/jit	18s
	2m 24s

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