mypy

gh-144289: Remove ENABLE_SPECIALIZATION_FT (gh-144290) #19295

Job	Run time
Run mypy on Tools/cases_generator	24s
Run mypy on Lib/test/libregrtest	17s
Run mypy on Tools/peg_generator	20s
Run mypy on Lib/_pyrepl	16s
Run mypy on Lib/tomllib	14s
Run mypy on Tools/jit	41s
Run mypy on Tools/clinic	19s
Run mypy on Tools/build	38s
Run mypy on Tools/check-c-api-docs	13s
	3m 22s

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