[issue20565] Update Tcl/Tk version for buildbots

[Terry J. Reedy]

Terry J. Reedy added the comment:

I think the Windows buildbots should use the version delivered with the installer.  While sticking with one tcl/tk version for one 18 to 24 month cycle is ok, perhaps we should consider updating the version delivered with 2.7. The features exposed by tkinter could remain stable even if new features are added to tcl/tk in micro releases. On linux, a program written for Python x.y may have to work with multiple tcl/tk versions.

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nosy: +terry.reedy

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