mypy

gh-149530: Remove `symtable.Class.get_methods` deprecated method (#14… #10539

Job	Run time
Run mypy on Tools/peg_generator	29s
Run mypy on Tools/jit	32s
Run mypy on Lib/test/libregrtest	35s
Run mypy on Tools/build	31s
Run mypy on Lib/_pyrepl	33s
Run mypy on Lib/tomllib	32s
Run mypy on Tools/clinic	29s
Run mypy on Tools/check-c-api-docs	27s
Run mypy on Tools/cases_generator	28s
	4m 36s

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