mypy

GH-142389: Add backtick markup support in description and epilog (#14… #18479

Job	Run time
Run mypy on Tools/jit	20s
Run mypy on Tools/peg_generator	20s
Run mypy on Tools/cases_generator	19s
Run mypy on Lib/_pyrepl	18s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/clinic	17s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/build	19s
	2m 30s

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