mypy

gh-145506: Fixes CVE-2026-2297 by ensuring SourcelessFileLoader uses … #19786

Job	Run time
Run mypy on Lib/_pyrepl	18s
Run mypy on Lib/test/libregrtest	23s
Run mypy on Tools/build	21s
Run mypy on Tools/check-c-api-docs	20s
Run mypy on Lib/tomllib	23s
Run mypy on Tools/cases_generator	17s
Run mypy on Tools/jit	22s
Run mypy on Tools/peg_generator	13s
Run mypy on Tools/clinic	19s
	2m 56s

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