[rubygems/rubygems] Fix typo

We want to update the original repo, not a fresh one.

This went undetected because the `git commit` command inside the
`update_git` method ignores failures, and in this case it was failing
because all files are untracked in the new repo.

I will fix that later but for now fix the typo.

https://github.com/rubygems/rubygems/commit/c889f1d715

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