mypy

gh-151483: Only declare `PyCodeObject._co_unique_id` on Free Threadin… #22193

Job	Run time
Run mypy on Lib/tomllib	17s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/clinic	19s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Tools/build	18s
Run mypy on Lib/_pyrepl	21s
Run mypy on Tools/peg_generator	20s
Run mypy on Tools/cases_generator	17s
Run mypy on Tools/jit	21s
	2m 49s

Provide feedback