mypy

gh-150244: Fix `test_create_subprocess_env_shell` to handle PATH with… #21516

Job	Run time
Run mypy on Tools/build	17s
Run mypy on Lib/tomllib	20s
Run mypy on Tools/jit	20s
Run mypy on Tools/check-c-api-docs	16s
Run mypy on Lib/_pyrepl	21s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/clinic	18s
	2m 49s

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