mypy

Add myself as a codeowner for the C API documentation (#145017) #19607

Job	Run time
Run mypy on Tools/check-c-api-docs	21s
Run mypy on Lib/test/libregrtest	25s
Run mypy on Lib/_pyrepl	19s
Run mypy on Lib/tomllib	23s
Run mypy on Tools/jit	20s
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/build	34s
Run mypy on Tools/clinic	24s
Run mypy on Tools/cases_generator	24s
	3m 29s

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