mypy

Add details about JIT build infrastructure and updating dependencies … #17901

Job	Run time
Run mypy on Tools/build	19s
Run mypy on Lib/_pyrepl	23s
Run mypy on Tools/clinic	19s
Run mypy on Tools/cases_generator	19s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/jit	16s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/peg_generator	21s
	2m 35s

Provide feedback