mypy

gh-145278: Revert "freeze encodings (partially) and linecache (#14527… #19840

Job	Run time
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/cases_generator	21s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Tools/build	20s
Run mypy on Lib/tomllib	18s
Run mypy on Lib/_pyrepl	19s
Run mypy on Lib/test/libregrtest	16s
Run mypy on Tools/clinic	17s
Run mypy on Tools/jit	20s
	2m 47s

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