[issue39107] Upgrade tcl/tk to 8.6.10 (Windows and maxOS)

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

The Windows part of this is done.  Existing tests also pass on my machine.

Ned, do you want this left open for macOS? or close?

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stage: patch review -> 

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39107>
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