mypy

gh-141808: Don't remove the JIT stencils when building with PGO (#141… #18360

Job	Run time
Run mypy on Tools/peg_generator	20s
Run mypy on Lib/_pyrepl	17s
Run mypy on Tools/cases_generator	19s
Run mypy on Lib/test/libregrtest	22s
Run mypy on Tools/clinic	20s
Run mypy on Tools/jit	19s
Run mypy on Tools/build	30s
Run mypy on Lib/tomllib	19s
	2m 46s

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