[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 existing patch mostly changes '9' to '10', which cannot in itself cause the test failure.  There must be a change in widget behavior.  Either Serhiy or Mark Rosemen might do better at diagnosing the discrepancy and whether _tkinter.c, tkinter.__init__, or tkinter/.../test_widget.py should be changed.
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PR branches on the main repository are discouraged.  It is just as easy and safer for another coredev to modify a fork branch.

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<https://bugs.python.org/issue39107>
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