mypy

gh-145870: Fix Format.SOURCE reference in get_annotations docstring (… #19991

Job	Run time
Run mypy on Tools/clinic	16s
Run mypy on Tools/build	19s
Run mypy on Tools/check-c-api-docs	20s
Run mypy on Tools/jit	21s
Run mypy on Tools/cases_generator	16s
Run mypy on Tools/peg_generator	28s
Run mypy on Lib/tomllib	29s
Run mypy on Lib/_pyrepl	22s
Run mypy on Lib/test/libregrtest	24s
	3m 15s

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