mypy

gh-144249: Report filename in SSLContext.load_cert_chain errors (#144… #19300

Job	Run time
Run mypy on Lib/tomllib	20s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/jit	19s
Run mypy on Tools/build	21s
Run mypy on Tools/peg_generator	21s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/clinic	17s
Run mypy on Tools/cases_generator	16s
Run mypy on Tools/check-c-api-docs	18s
	2m 48s

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