mypy

gh-142518: Add thread safety notes for the buffer protocol (#145911) #20013

Job	Run time
Run mypy on Lib/_pyrepl	35s
Run mypy on Tools/peg_generator	20s
Run mypy on Lib/tomllib	19s
Run mypy on Lib/test/libregrtest	59s
Run mypy on Tools/clinic	22s
Run mypy on Tools/build	21s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Tools/cases_generator	20s
Run mypy on Tools/jit	21s
	3m 55s

Provide feedback