mypy

gh-128615: Cover pickling of `ParamSpecArgs` and `ParamSpecKwargs` (#… #248

Job	Run time
Run mypy on Lib/_pyrepl	23s
Run mypy on Lib/test/libregrtest	25s
Run mypy on Tools/build	22s
Run mypy on Tools/cases_generator	23s
Run mypy on Tools/clinic	23s
Run mypy on Tools/jit	19s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/wasm	20s
	2m 56s

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