mypy

gh-131146: Fix month names in a "standalone form" in calendar module … #15959

Job	Run time
Run mypy on Lib/_pyrepl	20s
Run mypy on Tools/build	15s
Run mypy on Lib/tomllib	18s
Run mypy on Lib/test/libregrtest	17s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/jit	17s
Run mypy on Tools/clinic	20s
Run mypy on Tools/cases_generator	13s
	2m 18s

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