gh-125235: Keep `_tkinter` TCL paths pointing to base installation on… #10033

Job	Run time
Run mypy on Lib/_pyrepl	18s
Run mypy on Lib/test/libregrtest	14s
Run mypy on Tools/build	14s
Run mypy on Tools/cases_generator	13s
Run mypy on Tools/clinic	15s
Run mypy on Tools/jit	10s
Run mypy on Tools/peg_generator	20s
Run mypy on Tools/wasm	14s
	1m 58s

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