mypy

gh-149861: Fix rule in match statement `case_block` PEG grammar (GH-1… #10604

Job	Run time
Run mypy on Tools/clinic	19s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/cases_generator	20s
Run mypy on Lib/_pyrepl	18s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/build	20s
Run mypy on Tools/jit	18s
Run mypy on Lib/tomllib	17s
	2m 46s

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