[issue46996] Drop support of Tcl/Tk older than 8.5.12

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

8.5.12 will be 10 years old at the time of releasing 3.11.

We can relax the requirements for 8.5.x, so the code can be build with older versions, but some tests will fail because we removed workarounds for differences in behavior in older versions from tests.

The LTS distributions can also provide their own patches which relax the requirements.

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