[issue20565] Update Tcl/Tk version for buildbots

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2b8d9276ad5b by Zachary Ware in branch '2.7':
Issue #21303, #20565: Updated the version of Tcl/Tk used on Windows
http://hg.python.org/cpython/rev/2b8d9276ad5b

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nosy: +python-dev

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