mypy

gh-122623: Improve `c-api/bytearray.rst` with error handling info (#1… #1

Job	Run time
Run mypy on Lib/_pyrepl	13s
Run mypy on Lib/test/libregrtest	13s
Run mypy on Tools/build	11s
Run mypy on Tools/cases_generator	14s
Run mypy on Tools/clinic	11s
Run mypy on Tools/jit	13s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/wasm	15s
	1m 48s

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