mypy

gh-149425: Increase `test_write_without_source_date_epoch` assertion … #10523

Job	Run time
Run mypy on Tools/check-c-api-docs	15s
Run mypy on Tools/cases_generator	20s
Run mypy on Lib/_pyrepl	15s
Run mypy on Tools/jit	18s
Run mypy on Tools/build	19s
Run mypy on Tools/clinic	20s
Run mypy on Tools/peg_generator	21s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Lib/tomllib	16s
	2m 45s

Provide feedback