mypy

gh-146450: Ensure Android gradle build uses custom cross-build dir (#… #20661

Job	Run time
Run mypy on Tools/check-c-api-docs	16s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/build	19s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/peg_generator	17s
Run mypy on Lib/_pyrepl	17s
Run mypy on Tools/jit	16s
Run mypy on Tools/clinic	17s
	2m 38s

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