Consider upgrading bundled Tk to 8.6.13

[aivarannamaa]

Tcl/Tk 8.6.13 with many bugfixes was released a week ago. I think it's worth trying it out in the next Python 3.12 alphas and betas.

Linked PRs

• gh-99834: Update bundled copy of Tcl/Tk to 8.6.13.0 on Windows #101307
• gh-99834: Update macOS installer to Tcl/Tk 8.6.13. #104738
• [3.11] gh-99834: Update macOS installer to Tcl/Tk 8.6.13. (GH-104738) #110710

[zooba]

I've pushed builds of 8.6.13 to our deps repositories, so anyone can update the references now.

It seems we have to bring a copy of zlib as a DLL now, so the installers will need an update. I'm also a little bit concerned about it interfering with other modules, but there doesn't seem to be an easy way to statically link it anymore, so I guess we'll just have to deal with any fallout if it breaks stuff.

[aivarannamaa]

According to my tests the bundled 8.6.13 works nicely on Windows.

Now I am eagerly waiting for the update in the macOS installer.