gh-125235: Keep `_tkinter` TCL paths pointing to base installation on… #437

Job	Run time
Run mypy on Lib/_pyrepl	17s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/build	20s
Run mypy on Tools/cases_generator	15s
Run mypy on Tools/clinic	20s
Run mypy on Tools/jit	13s
Run mypy on Tools/peg_generator	15s
Run mypy on Tools/wasm	13s
	2m 12s

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