Remove unused entries in downloads module.

[jjhelmus]

No description provided.

[geofft]

tix needs to stay because it's still used on Windows on older Python versions and still works fine. I think this could be merged if you drop that commit and remove the other two entries?

[jjhelmus]

Right, tix was not removed from CPython until 3.13. From What’s New In Python 3.13:

Remove the tkinter.tix module (deprecated in Python 3.6).

That said, the tix download entry is not used. Tcl/Tk on Windows is provided by a prebuilt binary from python/cpython-bin-deps which includes tix in the tcltktk-8.6.* tags. The tix entry refers to the source which is not used during the build. It does serve to pull in the LICENSE.tix.txt file.