mypy

gh-146306: Optimize float operations by mutating uniquely-referenced operands in place (JIT only) #20143

Job	Run time
Run mypy on Lib/_pyrepl	16s
Run mypy on Tools/jit	18s
Run mypy on Lib/test/libregrtest	23s
Run mypy on Tools/clinic	19s
Run mypy on Lib/tomllib	16s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Tools/build	16s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/cases_generator	19s
	2m 43s

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