[rubygems/rubygems] Remove very old TODO note

It was added 10 years ago on a "146 additions, 170 deletions" commit
named "Deprecation removals and minor cleanup." that didn't explain much
other than that.

This TODO doesn't necessarily apply nowadays. I don't see how anyways.
TODO notes, if useful at all, should include a clear explanation of what
should be done either via the note itself or the commit message. This
note doens't meet any of these.

So I want to remove it because it distracts me every time I go through
it.

https://github.com/rubygems/rubygems/commit/58d81e8a32

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