[issue43652] Upgrade Windows tcl/tk to 8.6.11

[Terry J. Reedy]

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

Did you use revision 0, and in 8.6.11.0, or a later one?

As I mentioned in #43719, I cannot currently build master, but I will upload a PR (with .0) for CI to test.

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