mypy

gh-125610: Fix `STORE_ATTR_INSTANCE_VALUE` specialization check (GH-1… #11013

Job	Run time
Run mypy on Lib/_pyrepl	22s
Run mypy on Lib/test/libregrtest	27s
Run mypy on Tools/build	23s
Run mypy on Tools/cases_generator	24s
Run mypy on Tools/clinic	30s
Run mypy on Tools/jit	24s
Run mypy on Tools/peg_generator	23s
Run mypy on Tools/wasm	23s
	3m 16s

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