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

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

> PR branches on the main repository are discouraged.

I had another reason, which was that I needed to trigger a signed build of the separate Tcl and Tk binaries. This is much easier (and safer) to do from the main repo than my own fork.

But yeah, in general (for anyone else reading this), PRs from forks are fine. Tcl/Tk are special.

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