mypy

gh-145098: Use `macos-15-intel` instead of unstable `macos-26-intel` in `{jit,tail-call}.yml` #20423

Job	Run time
Run mypy on Tools/clinic	18s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/jit	22s
Run mypy on Tools/build	18s
Run mypy on Tools/cases_generator	14s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Lib/_pyrepl	22s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Tools/peg_generator	19s
	2m 47s

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